John's boat travels at a speed of 20km/hr in still water. He covers a distance of 90 km rowing against the current. He then covers the same distance rowing with the current. The total time in the two cases is 9 hours and 36 minutes. Find the speed of the current.

Is it 5 ?

Question

John's boat travels at a speed of 20km/hr in still water. He covers a distance of 90 km rowing against the current. He then covers the same distance rowing with the current. The total time in the two cases is 9 hours and 36 minutes. Find the speed of the current.

Is it 5 ?

ash2326 · Answer

Let speed of river be
$$ \frac{90}{20-5}+\frac{90}{20+5}=6+3.6= 9\ hours\ 36\ minutes$$
so you're correct:D

aroub · Answer

Oh great! I finally got something correct :) They're very hard :( But there are many ways to solve this problem right? -Thank you so much!! :D

ash2326 · Answer

You're welcome, these are easy . We just gotta keep some points in mind:)

ash2326 · Answer

If you have any doubt. I'd be glad to help

aroub · Answer

Yes I know! But.. I have some difficulties solving these problems. Hehe, I hope I don't find any, but if I found then THANK YOU :D

ash2326 · Answer

I also hope so. Best of luck:)

aroub · Answer

TY!