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 Chogfu - SA1 - 2011 Maths - PRi 6 Qn 11 - pls help to eloborate
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By: thayal (offline)  Saturday, April 28 2012 @ 07:11 AM CDT (Read 851 times)  
thayal


HI maths guru ..
pls help to answere the following question ..

Chogfu - SA1 - 2011 Maths - PRi 6 Qn 11 - pls help to elaborate
From level 1 to level 2, there were 2 flights of stairs of equal number of steps. for the first flight of stairs , jerry walked up some steps and ran 13 steps , and took a total of 38 seconds .then ,he got tired and for the second flight of stairs , he walked up some steps and ran 5 steps ,taking 70 seconds this time .(Assume that the speed of walking and running for both flights of stairs and run constant ).
How many minutes will jerry take if he only walks up from level 1 to level 2?

thyal

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By: MathIzzzFun (offline)  Saturday, April 28 2012 @ 11:52 PM CDT  
MathIzzzFun

Quote by: thayal


HI maths guru ..
pls help to answere the following question ..

Chogfu - SA1 - 2011 Maths - PRi 6 Qn 11 - pls help to elaborate
From level 1 to level 2, there were 2 flights of stairs of equal number of steps. for the first flight of stairs , jerry walked up some steps and ran 13 steps , and took a total of 38 seconds .then ,he got tired and for the second flight of stairs , he walked up some steps and ran 5 steps ,taking 70 seconds this time .(Assume that the speed of walking and running for both flights of stairs and run constant ).
How many minutes will jerry take if he only walks up from level 1 to level 2?

thyal



Hi

compare the time difference between running and walking same number of steps.

run 13 steps --> 38s
run 5 steps (& walk 8 steps) --> 70s
So, walking 8 steps --> 70-38 = 32s longer than running 8 steps
ie walking 1 step --> 4s longer than running 1 step.

Total time taken to walk both flights = (70 + 5 x 4) x 2 = 180s = 3 min

cheers.

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