Question

A man row a boat 120 km with stream in 5 hours, if the speed of the boat is double the speed of stream ,find the stream speed

Answer 1

Answer:

8 km/h

Step-by-step explanation:

distance covered by the boat =120 km =120*1000=1120000 meter

time taken by the boat to travel the the distance of 120 km =5 hours=5*60*60=18000 second

let the speed of stream be= v

and speed of boat =2 v (double the speed of stream)

speed= distance/time

total speed =v+ 2 v

(v+2 v)=120/5

3 v=120/5

v=120/15

v=8 km/h

v=(8*1000)/(60*60)

=20/9

=2.2 m/s