Question

42. Twenty minutes after a plane leaves the airport, it is reported to be 160 miles away. What average speed of the plane in the miles per hour?
Ms. Sue
It's your turn now. We'll be glad to check your answer.
20/60 = 1/3 of an hour

distance = speed * time

160 miles = speed * (1/3) hour

speed = 3 * 160 miles/hour

= 480 miles/hour

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