Bunuel wrote:

The distance between cities A and B is 120 miles. A car travels from A to B at 60 miles per hour and returns from B to A along the same route at 40 miles per hour. What is the average speed for the round trip?

(A) 48

(B) 50

(C) 52

(D) 56

(E) 58

Distance between A and B = 120 miles.

1st : Car travels from A to B at 60 miles/hour. Time of travel = 120/60 = 2 hour.

2nd : Car travels from B to A at 40 miles/hour. Time of travel = 120/40 = 3 hour

Average speed of round trip = (120+120)/(2+3) = 48 miles per hour.

Answer A.

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