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

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VP
Joined: 30 Sep 2004
Posts: 1430
Location: Germany
A gives B a start of 10 metres in a 100 metre race and still  [#permalink]

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20 May 2005, 07:07
00:00

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Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions

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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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Director
Joined: 07 Jun 2004
Posts: 599
Location: PA

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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
Senior Manager
Joined: 15 Mar 2005
Posts: 403
Location: Phoenix
Re: PS - Race 2  [#permalink]

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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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Director
Joined: 18 Feb 2005
Posts: 639

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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
Senior Manager
Joined: 17 Apr 2005
Posts: 353
Location: India

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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.
Director
Joined: 18 Feb 2005
Posts: 639

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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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Non-Human User
Joined: 09 Sep 2013
Posts: 9129
Re: A gives B a start of 10 metres in a 100 metre race and still  [#permalink]

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

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