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Was Jake's average running speed for the first hour of his

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Director
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Was Jake's average running speed for the first hour of his [#permalink] New post 19 May 2007, 11:26
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C
D
E

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Was Jake's average running speed for the first hour of his 26-mile marathon 11 miles per hour?
(1) He ran the entire 26 miles in 2.5 hours
(2) He ran the last 15 miles in 1.5 hours

OA later.
VP
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 [#permalink] New post 19 May 2007, 11:46
I can't see how you can solve this problem even with both statements becuase we are left with a void of half an hour that we know nothing about (2.5-1.5-0.5 = 0.5)

:?

My answer is (E)
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Re: DS Speed [#permalink] New post 19 May 2007, 12:08
vshaunak@gmail.com wrote:
Himalayan wrote:
vshaunak@gmail.com wrote:
Was Jake's average running speed for the first hour of his 26-mile marathon 11 miles per hour?

(1) He ran the entire 26 miles in 2.5 hours
(2) He ran the last 15 miles in 1.5 hours

OA later.


C


Will you explain pls?



i think i am missing something here but here is why I answered C:

total distance = 26
total time = 2.5 hours

last 15 miles took 1.5 hours, remaining (26-15) 11 miles must have taken (2.5-1.5) = 1 hour.

I am little confused. let me know if any.
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 [#permalink] New post 19 May 2007, 12:14
I'm guessing the OA is (C) ?

:shock:
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 [#permalink] New post 19 May 2007, 19:45
C

From S1 we get:
total distance = 26
total time = 2.5 hours
(insuff)

From S2 we get:
distance = last 15 miles
time = 1.5 hours
(insuff)

combining S1 and S2:
First part of the race 26-15= 11 miles
Time taken 2.5 - 1.5 = 1 hour
So Speed = 11m/hr

They ask for the average. So C it is
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 [#permalink] New post 19 May 2007, 19:56
one more C.

Same explanation given by Himalayan.
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 [#permalink] New post 20 May 2007, 02:29
Thanks guys OA is 'C'.
  [#permalink] 20 May 2007, 02:29
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