Question

a man swims 40 km downstream in 4 hrs and the same distance in the upstream in 20 hrs. find the speed of the stream​

Answer 1

Answer:

40 km = 4hrs

so that in 1 hr = 10 km

v = 10/1 = 10km/h

now on upstream 40 km in 20hr

so that 2 km = 1hr

v = 2/1 = 2km/h

speed = 10-2 = 8km/h