Time and Distance Q.9

9A train completed half a trip at 30 miles per hour and the other half at 60 miles per hour. If the whole trip was of 20 miles, then how much time did the train take to complete the trip?

Option : D
Explanation : Average speed = 2 × 30 × 60/(30 + 60) = 2 × 30 × 60/90 = 40 mph
Time taken by train to complete the trip = Distance/ Speed = 20/40 = 1⁄2 hr = 30 min.

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