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

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