Latest SSC Aptitude Question SOLUTION: If Rahul rows 15 km upstream in 3 hours and 21 km downstream in 3 hours, then the speed of the stream is 5 km/hr 4 km/hr 2 km/hr 1 km/hr

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(#M40022715) SSC Numerical Ability question ALGEBRA Keep an EYE

If Rahul rows 15 km upstream in 3 hours and 21 km downstream in 3 hours, then the speed of the stream is

5 km/hr
4 km/hr
2 km/hr
1 km/hr

Asked In SSC MAN (10 years ago)

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Read Solution (2) :

Rahul Kumar Raman  (7 years ago)

let's assume the speed of rahul in still water is X km/hr
and speed of stream is Y km/hr.
So the speed of rahul in upstream will be (X-Y)km/hr
So in 3 hr he will travel 3(X-Y)
According to the question,
3(X-Y)=15=>X-Y=5-----------(1)
speed of rahul in downstream will be (X+Y)km/hr
So in 3 hr he will travel 3(X+Y)
According to the question,
3(X+Y)=21=>X+Y=7--------(2)
On solving eqn 1 and 2,
X=6 km/hr,Y=1 km/hr

Is this solution Helpfull? Yes | No (1)  

Aman kumar  (7 years ago)

Rahul rows 15 km upstream in 3 hours and 21 km downstream in 3 hours, then the speed of the stream is

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