A boat whose speed in still water is 15 km/h goes 30 km downstream and comes back upstream in 4.5 hours.
What is the speed of water current?1
10 km/h
2
5 km/h
3
6 km/h
4
4 km/h
A boat whose speed in still water is 15 km/h goes 30 km downstream and comes back upstream in 4.5 hours.
What is the speed of water current?