A) time = distance/speed For the first half of the trip, the time used was .. (1 mi)/(12 mi/h) = (1/12) h = 5 minutes Then the last half of the trip took 10 minutes, 1/6 hour. .. speed = distance/time .. = (1 mi)/(1/6 h) = 6 mi/h
The speed for the last half of the trip was 6 mph.
b) The average speed was .. (2 mi)/(1/4 h) = 8 mi/h
