Tom drives at a constant speed of 60 mph for 6 hours and the

Tom drives at a constant speed of 60 mph for 6 hours and then at a constant speed of 40 mph for 4 hours. Find his average speed (in mph) for the 10 hours.
A. 10 B. 20 C. 50 D. 52 e 55 2/3

Solution

[(60*6)+(40*4)]/10=(360+160)/10=520/10=52 mph. is the average speed.
Aanswer D).