The speed of a boat in still water is 15 km/h. It can go 30 km upstream and return downstream to the original point in 4 h 30 min. The speed of the stream is:
1
5 km/h
2
8 km/h
3
10 km/h
4
15 km/h
The speed of a boat in still water is 15 km/h. It can go 30 km upstream and return downstream to the original point in 4 h 30 min. The speed of the stream is: