In the morning, John drove to his mother's house in the village at an average speed of 60 kilometers per hour. When he

[Vincen]

In the morning, John drove to his mother's house in the village at an average speed of 60 kilometers per hour. When he was going back to town in the evening, he drove more cautiously and his speed was lower. If John went the same distance in the evening as in the morning, what was John's average speed for the entire trip?

(1) In the evening, John drove at a constant speed of 40 kilometers per hour.
(2) John's morning drive lasted 2 hours.

Answer: A

Source: GMAT Club Tests