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A highway and a train track run parallel to each other. At 5:00 a train crosses a river. Fifteen minutes later, a car, traveling in the same dirrection, crosses the river. The train's average speed is 52mph, the car's is 64mph. When will the car pass the train?
15 minutes = 1/4hour, so train traveling 52mph is 13 miles away from the car over the river.
64 - 52 = The vehicles are converging at a rate of 12mph.
From D = RT, T = D/R. So,
T = 13/12
13/12 = 1 and 1/12th of an hour, or 65 minutes.
The car should pass the train in 01:05, or at 6:05.
This answer is not listed among the choices.
WTF?
15 minutes = 1/4hour, so train traveling 52mph is 13 miles away from the car over the river.
64 - 52 = The vehicles are converging at a rate of 12mph.
From D = RT, T = D/R. So,
T = 13/12
13/12 = 1 and 1/12th of an hour, or 65 minutes.
The car should pass the train in 01:05, or at 6:05.
This answer is not listed among the choices.
WTF?