Question

How long will it take to row 20 km upstream if one can row 10 km in 10 minutes in still water and the same distance in 8 minutes with the stream?

Answer 1

Answer:

26.67min

Step-by-step explanation:

Let x be the speed of man in still water and y be the speed of stream.

∴ Speed of man (x) = 60 km/hr and speed of downstream = 75 km/hr. ∴ Speed of stream = 15 km/hr.

Hence upstream speed = 60 – 15 = 45 km/hr.

So time taken to cover 20 km = 20/45*60 = 26.67min.

if you like my ans please thanks me