A man can row 7.5 km/hr in still water and finds that it takes him twice as much time to row up than as to down the same distance in the river. The speed of the current is:

Options
- 3.5 km/hr
- 3.90 km/hr
- 2.5 km/hr
- none

CORRECT ANSWER : 2.5 km/hr

Discussion Board
ANSWER IS

let us assume the speed of the currnet is x
then in que the mentioned that 7.5 in still water i.e 7.5+x i.e down stream speed
it takes 2 times more in upstream so 2(7.5-x) in up stream speed
from the ab eqs 7.5+x=15-2x=3x=7.5
x=7.5/3=2.5


Sandeep kumar 05-13-2021 01:25 AM

Ntg

Answer?

Charitha 06-30-2020 09:43 PM

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