Question

A swimmer takes thrice as much time for rowing from A to B upstreams as compared
to what he takes to row from B to A. If he rows at the speed of 10 km/hr in still water,
then what will be the speed of current ?
1) 3 km/hr
2) 4 km/hr
3) 5 km/hr
4) 6 km/hr​

Answer 1

3

Step-by-step explanation:

5km/hr because their is a no time given in ques

Answer 2

Step-by-step explanation:

Let the speed of swimmer (in still water) be x km/hr and that of the water current be y km/hr.

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■Remember■:

Upstream => speed of swimmer-Speed of water current i.e. x-y

Downstream => speed of swimmer +Speed of water current i.e. x+y

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From the given condition,

3(x-y)=x+y

But,

x=10

Thus,

30-3y=10+y

y=5

So,

The speed of water current is 5km/hr.

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Bcoz I am also solving same... XD XD