Q. 17 A4.2( 5 Votes )

# A man can row a b

Answer :

Speed of boat in still water = 4 km/h

Let the speed of stream be 'x'

Therefore,

Speed of the boat upstream = Speed of boat in still water - Speed of stream = 4 - x

Speed of the boat downstream = Speed of boat in still water + Speed of stream = 4 + x

Time taken to go upstream

Time taken to go downstream

Given, time taken in upstream is thrice as in downstream

⇒ 4 + x = 12 - 3x

⇒ 4x = 8

⇒ x = 2

i.e. the speed of stream = x is 2 km/hour.

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