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At 12:00 hour a truck left the city A to city B, at a constant speed of 45 km/h. One hour later, a car left the city B to the city A, along the same road, at a constant speed of 100 km/h. If the distance between A and B is 190 km, at what time will the truck and the car meet each other?
A. 12:40
B. 13:00
C. 14:00
D. 14:40
E. 16:00
==> this is a common velocity question in gmat math test. remember that here, the same time flows the situation.
in case of A truck, it travels at the speed of 45km/h, thus it traveled 45km after 1 hour.
In case of A car, it travels at the speed of 100km/h, and since it started traveling at 13:00, we have 45+45T+100T=190.(It's not the separate t1, t2 here because the same time flows for both the car and truck. Therefore it's just T.)
145T=145, T=1 and therefore at 14:00, the truck and car meet. C is the answer.
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