GMAT Quantitative Reasoning Practice Test 3

Question : 78 of 100

Marks: +1, -0

Two trains are traveling on a collision course. If train A is traveling at a speed of 350 mph and train B is traveling 28% slower, how much time will it take the trains to collide if the initial distance between the two is 1505 miles?

Two hours and 30 minutes.
One hour and 10 minutes.
Two hours and 25 minutes.
Three hours and 15 minutes.
Four hours and 20 minutes.

Validate

Solution:

Train B is traveling at a speed of

0.72 × 350=252 {\mph}

.
The two trains are traveling in opposite directions.
Thus, the distance should be divided by the sum of their speeds

=252+350=602 {\mph} .1505

miles

\/ 602=2.5=

two hours and 30 minutes.

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