A man can row at a speed of 4.5 km/hr in still water to a certain upstream point and back to the starting point in a river which flows at 1.5 km/hr.find his average speed for total journey.
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Answered by
13
downstrean spd =4.5-1.5=3
avg. speed=2×4.5×3/(4.5+3)
=27/7.5
=270/75=18/5=3.6kmph
avg. speed=2×4.5×3/(4.5+3)
=27/7.5
=270/75=18/5=3.6kmph
Answered by
15
Answer:
ans is 4
Explanation:
(speedof upstream*speed of downstram )/ speed in still water
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