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Q.

A covers a certain distance by car at 35 km/hr and he returns back on a scooter with a speed of 25 km/hr then the average speed of the whole journey is

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a

29 km/hr

b

29.16 km/hr

c

29.61 km/hr

d

30 km/hr

answer is B.

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Detailed Solution

Given, A=35km/hr,B=25km/hr

Average speed =2ABA+B=2×35×2560=1756

=29.16km/hr.

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A covers a certain distance by car at 35 km/hr and he returns back on a scooter with a speed of 25 km/hr then the average speed of the whole journey is