Question

Find the Speed of the Current
A man can row 2 and 8/3 km/hr in still water and he finds that it takes him thrice as much time to row up then as to row down the same distance in the river. Find the speed of the current.

Answer 1

A man can row913913kmph in still water and finds that it takes him thrice as much time to row up than as to row, down the same distance in the river. The speed of the current is.323kmph323kmph423kmph423kmph523kmph523kmph623kmph623kmph

Answer: Option B

Explanation:

Friends first we should analyse quickly that what we need to calculate and what values we require to get it. 

So here we need to get speed of current, for that we will need speed downstream and speed upstream, because we know
Speed of current = 1/2(a-b) [important]

Let the speed upstream = x kmph
Then speed downstream is = 3x kmph [as per question]

speed in still water = 12(a+b)=>12(3x+x)=>2x as per question we know, 2x=913=>2x=283=>x=143speed in still water = 12(a+b)=>12(3x+x)=>2x as per question we know, 2x=913=>2x=283=>x=143
So, 
Speed upstream = 14/3 km/hr, Speed downstream 14 km/hr. 
Speed of the current=12[14−143]=143=423kmph