Q. 17 A4.2( 5 Votes )
A man can row a b
Speed of boat in still water = 4 km/h
Let the speed of stream be 'x'
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.
Rate this question :