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Truckers Jack and Dave drove their truck along a straight route. If Ja

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Math Expert
Joined: 02 Sep 2009
Posts: 58381
Truckers Jack and Dave drove their truck along a straight route. If Ja  [#permalink]

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22 Oct 2018, 00:12
1
5
00:00

Difficulty:

25% (medium)

Question Stats:

75% (01:09) correct 25% (01:13) wrong based on 73 sessions

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Truckers Jack and Dave drove their truck along a straight route. If Jack made the trip in 12 hours, how many hours did it take Dave to make the same trip?

(1) Dave’s average speed for the trip was 3/5 of Jack’s average speed.

(2) The length of the route is 720 miles.

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Intern
Joined: 21 Apr 2018
Posts: 13
Re: Truckers Jack and Dave drove their truck along a straight route. If Ja  [#permalink]

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22 Oct 2018, 08:29
2
They both traveled the same distance, which can be 1. Therefore, Jack's rate is 1/12.

1.) Dave's average speed was 3/5 of Jack's speed. Therefore, Jack's rate was 1/12 * 3/5 = 1/20. Therefore, Dave can make the trip in 20 hours. Sufficient.

2.) Does not tell us anything about Dave. Insufficient.

Re: Truckers Jack and Dave drove their truck along a straight route. If Ja   [#permalink] 22 Oct 2018, 08:29
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