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Q.

A man set on a journey. He travelled for a total of 16 hours. He covered the first half of the distance at a speed of 40 km per hour and the second half of the distance at 60 km per hour. How much distance did he cover?

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a

384 km

b

768 km

c

800 Km

d

960 Km

answer is B.

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Detailed Solution

Average speed =2xyx+y=2×40×6040+60

=2×40×60100=48km/hr

Total time = 16 hours 

Total distance covered by him = 48 x 16 = 768 km

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