A person travels from A to B at a speed of 40 kmph and returns by increasing his speed by 50%. What is his average speed for both the trips?
Answer: 48 km/h
Explanation
Given:
-
Speed from A to B = 40 km/h
-
Speed from B to A = 40 km/h + 50% of 40 km/h = 40 + 20 = 60 km/h
Find:
Average speed for the whole journey (both ways).
Formula for average speed when distance is the same but speeds differ:
Plug in values:
=2×40×6040+60=4800/100
=48 km/h
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