A man goes to a place at the rate of 4km per hour. He comes back on a bicycle at 16km per hour. His average speed in km per hour for the entire journey is
5
6.4
8.5
10
A
10
B
5
C
6.4
D
8.5
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Solution
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The man goes at the rate of 4 km/hour and comes back at 16 km/hour,
We know, average speed =(product of speedsum of speed×2)=2×(4×164+16)=2×6420=6.4km/hour.
∴ option B is correct.
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