GMAT Quantitative Reasoning Practice Test 3

Question : 24 of 100

Marks: +1, -0

Two cars are traveling on the same road towards each other. If car A is traveling at a speed of

120 {\km} {/} {\h}

and car B is traveling

15 \%

slower, how much time will it take the cars to meet if the initial distance between the two is

668.4 {\km}

and car

{\A}

started to drive one hour and a half before car B started?

Solution:

Car B is traveling at a speed of

0.85 × 120=102 {\km} {/} {\h}

.
Car A travels alone a distance of

120 × 1.5=180 {\km}

. The remaining distance should be divided among the sum of the cars speeds:

668.4-180=488.4 {\km}, 488.4 {/}(102+120)=2.2=

two hours and 12 minutes.

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