Tough Mathematical Qns (Help!!!)

[Ivan96935sg]

Calling all maths genius for help........to solve the following qns:-

Tried to solve but then apparently my maths had returned a huge bulk to my former teachers.

 

 

There were 2 identical flight of steps. For the 1st flight of steps, Jim walked up some steps and ran 7 steps in 70s. For the 2nd flight of steps, he walked up some steps and ran 15 steps in 46s. How long did Jim take to walk up both flight of steps? (Ans: 182s).

 

 

[Simplesilver]

Do you mean how long was his journey to get to the top of the stairs?

or you mean, how long will he take if he walk up the stairs and not run?

[Ahleon]

x=walk

y=run

 

 

x+7y = 70 ---(1)

x+15y = 46 ---(2)

 

(1)x15 -> 15x + 105y = 1050 ---(3)

(2)x7 -> 7x + 105y = 322 ---(4)

 

(3)-(4) -> 8x = 728

 

therefore x = 91s, if he walk up the 2 flight of stairs he will use 91s x 2 which is 182s

Edited January 15, 2010 by Ahleon

[Wadexu]

Calling all maths genius for help........to solve the following qns:-

Tried to solve but then apparently my maths had returned a huge bulk to my former teachers.

 

 

There were 2 identical flight of steps. For the 1st flight of steps, Jim walked up some steps and ran 7 steps in 70s. For the 2nd flight of steps, he walked up some steps and ran 15 steps in 46s. How long did Jim take to walk up both flight of steps? (Ans: 182s).

the difference of 1st and 2nd: 70-46 = 24s

2nd step run more step: 15-7=8

so every step run/walk difference is 24/8=3s

so for 1st flight of step, if all walk need 70+7*3 = 91s

for 2nd flight of step, if all walk need 46 + 15*3 = 91s

Total = 91*2 = 182 s

 

am I math genius? YES

Edited January 15, 2010 by Wadexu

[Sucker]

It looks like test english first and test math later...

 

Calling all maths genius for help........to solve the following qns:-

Tried to solve but then apparently my maths had returned a huge bulk to my former teachers.

 

 

There were 2 identical flight of steps. For the 1st flight of steps, Jim walked up some steps and ran 7 steps in 70s. For the 2nd flight of steps, he walked up some steps and ran 15 steps in 46s. How long did Jim take to walk up both flight of steps? (Ans: 182s).

 

[Coltplussport]

Calling all maths genius for help........to solve the following qns:-

Tried to solve but then apparently my maths had returned a huge bulk to my former teachers.

 

 

There were 2 identical flight of steps. For the 1st flight of steps, Jim walked up some steps and ran 7 steps in 70s. For the 2nd flight of steps, he walked up some steps and ran 15 steps in 46s. How long did Jim take to walk up both flight of steps? (Ans: 182s).

 

 

the time he saved by running up instead of walking up 8 steps(15-7) is 70s-46s=24s

 

one step walking takes up 3s more.

 

So if he walk 7 steps instead of running, he took 3s x 7 = 21s more

 

So total for 1st flight of stairs is 70s +21s =91s

 

so 2 flight = 2 x 91s = 182s

[Ah_cow]

There were 2 identical flight of steps. For the 1st flight of steps, Jim walked up some steps and ran 7 steps in 70s. For the 2nd flight of steps, he walked up some steps and ran 15 steps in 46s. How long did Jim take to walk up both flight of steps? (Ans: 182s).

 

yes, an English test. this will make it clearer.

 

There were 2 identical flight of steps. For the 1st flight of steps, Jim walked up some steps and ran 7 steps in a total of 70s. For the 2nd flight of steps, he walked up some steps and ran 15 steps in a total of 46s. How long did Jim take to walk up both flight of steps? (Ans: 182s).

[Simplesilver]

ahh. that will be so much clearer.

but i guess the answer are already up there. =D

[Ivan96935sg]

Thanks so much for the solution. Algebra method seems easier to understand but then my kid have not really gone into algebra yet.

[Christan]

Based on the above solution, so X=91 and Y=-3. So if assuming ran 32 steps, the time taken will be -5s. So this is a mathematical Q but with an illogical outcome.

[Ah_cow]

x=walk

y=run

 

 

x+7y = 70 ---(1)

x+15y = 46 ---(2)

 

(1)x15 -> 15x + 105y = 1050 ---(3)

(2)x7 -> 7x + 105y = 322 ---(4)

 

(3)-(4) -> 8x = 728

 

therefore x = 91s, if he walk up the 2 flight of stairs he will use 91s x 2 which is 182s

 

pardon me for my limited knowledge, your solution too chim for me.

what exactly is 'x'? i assume is time spend on walking, then 'x' is not the same for both equation right?

[Sucker]

U are right...

a=number of total steps, y=walking steps per second and x=running steps per seconds

 

For alegbra,

Equation1

[a-7]/y+7/x=70

Equation2

[a-15]/y+15/x=46

 

The question and answer are not logically correct....The total time taken is 70s+46s=116s and the answer is for walking step is 182s more than total time taken...

 

Based on the above solution, so X=91 and Y=-3. So if assuming ran 32 steps, the time taken will be -5s. So this is a mathematical Q but with an illogical outcome.

Edited January 15, 2010 by Sucker

[Zniper]

how come everytime i do not hav the chance to reply 1st (was outside client's place)?? haiz, so many maths experts here.. i no need to makan le.. wanted to look for tuition jobs in maths but looks like there are many out there fighting wif me...

[Ah_cow]

U are right...

a=number of total steps, y=walking steps per second and x=running steps per seconds

 

For alegbra,

Equation1

[a-7]/y+7/x=70

Equation2

[a-15]/y+15/x=46

 

The question and answer are not logically correct....The total time taken is 70s+46s=116s and the answer is for walking step is 182s more than total time taken...

 

i guess is english problem again... question should be asking what is the total time taken if he is to ONLY walk up both flight of stairs.

[Ah_cow]

the time he saved by running up instead of walking up 8 steps(15-7) is 70s-46s=24s

 

one step walking takes up 3s more.

 

So if he walk 7 steps instead of running, he took 3s x 7 = 21s more

 

So total for 1st flight of stairs is 70s +21s =91s

 

so 2 flight = 2 x 91s = 182s

 

this answer explain quite clearly i guess.

[Ah_cow]

Based on the above solution, so X=91 and Y=-3. So if assuming ran 32 steps, the time taken will be -5s. So this is a mathematical Q but with an illogical outcome.

 

if u looking at the correct solution, Y=-3 is the time save on running compare to walking. that means 3sec difference. so if he ran 32 steps, he would have save 96secs compare to walking.

[Sucker]

Your english is clearer.... the question posed below is correct... just that the question did not drill into my mind.. tend to drift off...

 

How long did Jim take to walk up both flight of steps? (Ans: 182s).

 

 

i guess is english problem again... question should be asking what is the total time taken if he is to ONLY walk up both flight of stairs.

 

[Christan]

U got that right, sucker. Nowadays maths Q also test u on your grasp of english