jmc

Question

The trip from Carville to Nikpath requires 4 12 hours when traveling at an average speed of 70 miles per hour. How many hours does the trip require when traveling at an average speed of 60 miles per hour? Express your answer as a decimal to the nearest hundredth.

Accepted Answer

Since distance=ratetime, decreasing speed by a factor of 67 increases the amount of time the trip takes by 76. Therefore, at 60 miles per hour the trip takes 412 76=9276=214=5.25 hours.