Bunuel wrote:
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 kmh.
(2) John's morning drive lasted 2 hours.
MH = Mother's house, T = Town
T -> MH, speed was 60 km/h
MH -> T, speed was reduced.
Statement 1, gives reduced speed
Average speed = 2 * a * b/ (ab), we get the value sufficient
2) Just knowing the time wont help us.
Answer A
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