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A gives B a start of 10 metres in a 100 metre race and still

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VP
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A gives B a start of 10 metres in a 100 metre race and still  [#permalink]

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New post 20 May 2005, 07:07
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A gives B a start of 10 metres in a 100 metre race and still beats him by 1.25 seconds. How long does B take to complete the 100 metre race if A runs at the rate of 10 m/sec?

(1) 8 seconds
(2) 10 seconds
(3) 16.67 seconds
(4) 12.5 seconds

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New post 20 May 2005, 09:59
A gives B a start of 10 metres in a 100 metre race and still beats him by 1.25 seconds. How long does B take to complete the 100 metre race if A runs at the rate of 10 m/sec?


A takes 100/10 = 10 seconds to complte the race

so B will take 10 + 1.25 = 11.25sec to complete 90M as B has a head start of 10M to A

so B will take 100 * 11.25 / 90 = 12.5 Seconds

ANS = 12.5 Sec
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Re: PS - Race 2  [#permalink]

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New post 20 May 2005, 13:08
90/B - 1.25 = 100/10
=> 90/B = 11.25 => B = 8m/s.
Therefore time taken for 100m = 100/8 = 12.5
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  [#permalink]

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New post 20 May 2005, 14:23
1
When A runs 100m B runs 90 mts.

==>> B take 1.25 s to run 10 mts

So to run 100mts B takes 12.5 secs
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New post 22 May 2005, 07:11
gmat2me2 wrote:
When A runs 100m B runs 90 mts.

==>> B take 1.25 s to run 10 mts

So to run 100mts B takes 12.5 secs


gmat2me2 although you have got the right answer , i think you have made a mistake.

When A runs 100 m B runs 80 meters (assuming the answer), then the basis on which you got the answer is wrong.

When A ran 100 meters, B hadn't completed the race which was reduced to 90m for him, so you should not conclude that he ran 90 meters.

HMTG.
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New post 22 May 2005, 20:39
HowManyToGo wrote:
gmat2me2 wrote:
When A runs 100m B runs 90 mts.

==>> B take 1.25 s to run 10 mts

So to run 100mts B takes 12.5 secs


gmat2me2 although you have got the right answer , i think you have made a mistake.

When A runs 100 m B runs 80 meters (assuming the answer), then the basis on which you got the answer is wrong.

When A ran 100 meters, B hadn't completed the race which was reduced to 90m for him, so you should not conclude that he ran 90 meters.

HMTG.


Appreciate your catch but can you please rephrase your concern? I wasnt able to get what you were trying to convey...Sorry about it

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Re: A gives B a start of 10 metres in a 100 metre race and still  [#permalink]

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New post 15 Aug 2018, 09:43
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Re: A gives B a start of 10 metres in a 100 metre race and still &nbs [#permalink] 15 Aug 2018, 09:43
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