on mary's walk she covered the 3- mile distance to the parkin one hour. however, the return trip took her one and a half hours. what was her average speed for the round trip? multiple choice: A. 2.4mph B. 2.5mph C. 2.8mph D.3.9mph

Question

on mary's walk she covered the 3- mile distance to the parkin one hour. however, the return trip took her one and a half hours. what was her average speed for the round trip? multiple choice: A. 2.4mph  B. 2.5mph  C. 2.8mph   D.3.9mph

zepp · Answer

Mary's first trip: 3 miles/h
Mary's 2nd trip: 3 miles/1.5h => 2 miles/h

Now find the average by summing 3 miles/h and 2 miles/h divide by 2 (because of the 2 hours)

zepp · Answer

So B) 2.5mph