A watercraft is rowed down 32 km along a river in 4 hours and 10 km against the river in 5 hours. Find the speed of the watercraft and that of the river.

A

4.5 km/h and 2.5 km/h

B

4 km/h and 3 km/h

C

5 km/h and 3 km/h

D

3.5 km/h and 1.5 km/h