Question

Michael drove from point A to point B at 15 miles

per hour and immediately returned by the same
route at 30 miles per hour. What was his average
speed, in miles per hour, for the entire trip?
E. 20
F. 22.5
G. 24
H.25

Answer 1

E

Explanation:

Say the distance is 'd'

time for going = d/15

time for returning = d/30

average speed = total distance / ( total time)

= 2d / ( d/15 + d/30 )

solve for average speed = 20 mi/hr

Answer 2

I wish I can help you out to this work