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On a trip of 200 miles, a man travels at the rate of 40 miles per hour for the first 100 miles. For the rest of the trip, he travels at the rate of 55 miles per hour . What is his average speed, in miles per hour, for the total trip ?

On a trip of 200 miles, a man travels at the rate of 40 miles per hour for the first 100 miles. For the rest of the trip, he travels at the rate of 55 miles per hour . What is his average speed, in miles per hour, for the total trip ? Correct Answer 400/9

Total time spent = 100/40 + 100/55 = 5/2 + 20/11 = 95/22 hours Average speed = 200 / (95/22) = 200 x 22 / 95 =   880/19 miles per hour

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