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# Driving 1.5 times slower, Bill was late for school today.

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Senior Manager
Joined: 19 Mar 2008
Posts: 350
Driving 1.5 times slower, Bill was late for school today. [#permalink]

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11 Aug 2008, 08:10
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Question Stats:

100% (01:19) correct 0% (00:00) wrong based on 3 sessions

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Driving 1.5 times slower, Bill was late for school today. What is the usual time it takes Bill to drive to school? (Assume that each day Bill takes the same route).

(1) It took Bill 15 more minutes to drive to school today than usually
(2) The distance between home and school is 15 miles
Manager
Joined: 15 Jul 2008
Posts: 205
Re: DS: Driving 1.5 times slower [#permalink]

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11 Aug 2008, 09:09
judokan wrote:
Driving 1.5 times slower, Bill was late for school today. What is the usual time it takes Bill to drive to school? (Assume that each day Bill takes the same route).

(1) It took Bill 15 more minutes to drive to school today than usually
(2) The distance between home and school is 15 miles

I think A.

If Bill drives 1.5 times slower, then he takes 1.5 time more time. At usual speed if Bill takes time t, then at the reduced speed he will take 1.5t. We need to find t.

1) Sufficient. It says today bill took t+15 mins. So 1.5t = t+15. Solving we get t=30 mins.

2) The distance is 15 miles. But it does not give any information on speed or time. So insufficient.

A.
Senior Manager
Joined: 06 Apr 2008
Posts: 401
Re: DS: Driving 1.5 times slower [#permalink]

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11 Aug 2008, 09:27
judokan wrote:
Driving 1.5 times slower, Bill was late for school today. What is the usual time it takes Bill to drive to school? (Assume that each day Bill takes the same route).

(1) It took Bill 15 more minutes to drive to school today than usually
(2) The distance between home and school is 15 miles

A)

Statement 1) tells 1.5*time = time + 15 which means time=30

Statement 2) does not tell anything about speed so cant figure out time
Re: DS: Driving 1.5 times slower   [#permalink] 11 Aug 2008, 09:27
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