Juan drives all the way from his office to his girlfriend’s house at an average speed of 20 miles per hour, he drives back to his office by the same route. If he wants to average 24 miles per hour for the round trip, at what average speed should he drive home?
(A) 25
(B) 26
(C) 28
(D) 29
(E) 30
2.20.x/(20+x) = 24
ReplyDelete16x = 480
x = 30
Many people choose 28 quickly.