Question

a boat covers a certain distance downstream in one and half hours it covers distance upstream in 2 hours . thespeed of the boat in still wateris 35 km/hour. find the speed of the stream

Answer 1

in downstream a boat covered 1 hour 30 min
in upstream a boat covered in 2 hour ..
the speed of the boat still in water = 35 km/hour
total time = 2 hour - 1hour 30 min
= 30 min
in 1 hour = 60 min a boat covered 35 km
then 30 min covered = (35/60)×30 km
= 17.5 km
so sped of the boat is 17.5km/hour