A man makes a 255-mile trip by car. He drives the first 2 hours at 45 miles per hour. At what speed must he then travel for the remainder of the trip in order to arrive at his destination 5 hours after he started?

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Accepted Answer

The distance traveled by driving at 45 mph for 2 hours is 2 x 45, or 90 miles. The remainder of the 255 mile trip is 255 - 90, or 165 miles. To finish the trip in 5 hours, the man has 5 - 2, or 3, hours still to drive. To find the rate of travel for a distance of 165 miles driven in 3 hours, divide the distance by the time. 165 / 3 = 55 miles per hour

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