GMAT Quantitative Reasoning Practice Test 5

Question : 17 of 100

Marks: +1, -0

A Barman’s train rails across an open track at 250 kilometers per hour. A regular passenger train travels at 68% of the Barman’s train speed. If the two trains start moving from the same station at the same time, how much time longer will it take the passenger train than the Barman’s to travel 850 kilometers?

2 hours and 24 minutes.
1 hour and 24 minutes.
2 hours and 36 minutes.
1 hour and 36 minutes.
5 hours.

Validate

Solution:

Let's find the time it takes each train to travel

850 {\km}

.
The fast train:

850 \/ 250=3.4

hours.
The slow train:

0.68 × 250=170 {\km} \/ {\h}

. So the time is

850 \/ 170=5

hours. The difference between the travel times is 1.6 hours or 1 hour and 36 minutes.

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