TOM traveled the entire 20 miles trip. If he did the first 10miles of at a constant rate 12 miles per hour and the remaining trip of at a constant rate 10 miles per hour, what is the his average speed, in miles per hour?	Answers.
A) 12.45 mph
B) 11.25 mph
C) 10.95 mph
D) 10.91 mph
E) 10.56 mph
avg speed = total distance/ total time = (d1+d2)/(t1+t2) = (10+10) / ((10/12)+(10/10) =120/11 = 10.91 mph 10.91 mph
<result>D</result>
TOM traveled the entire 20 miles trip. If he did the first 10miles of at a constant rate 12 miles per hour and the remaining trip of at a constant rate 10 miles per hour, what is the his average speed, in miles per hour?