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?
2 answers
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20/60 = 1/3 of an hour
distance = speed * time
160 miles = speed * (1/3) hour
speed = 3 * 160 miles/hour
= 480 miles/hour
distance = speed * time
160 miles = speed * (1/3) hour
speed = 3 * 160 miles/hour
= 480 miles/hour