SOLUTION: A truck enters a highway driving 60 mph. A car enters the highway at the same place 5 minutes later and drives 70 mph in the same direction. From the time the car enters the hig
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Question 1174394: A truck enters a highway driving 60 mph. A car enters the highway at the same place 5 minutes later and drives 70 mph in the same direction. From the time the car enters the highway, how long will it take the car to pass the truck? Answer by ikleyn(52855) (Show Source):
The rate 60 mph is 1 mile per minute.
In 5 minutes, the truck will have 5 miles head start comparing with the car.
Their relative speed is 70-60 = 10 mph.
It means that the distance between them decreases at the rate of 10 miles per hour.
Therefore, the car will catch the truck in = 0.5 of an hour.
ANSWER. The car will overtake the car in 0.5 of an hour, or in 30 minutes.
