A car is going up a hill. The hill is one mile long. The driver goes up the hill at an average speed of 30 miles per hour. When the driver reaches the top of the hill, he starts down the other side. The downhill side is also one mile long. How fast must the driver go down the hill in order to average 60 miles per hour?
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Answer:
90 mi/h
Step-by-step explanation:
(30 + v) / 2 = 60
30 + v = 120
v = 90
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