Question

Speed of boat in still water is 15 km per hour if goes 30 km upstream and returns back at the same point in 4 hour 30 minutes find the speed of stream

Answer 1

distance will be 60 k m
time =4.3hours
speed in still water =15
we can neglect the speed of stream as boat is going both up and down
15=60/4.3=13.9
speed of stream would be 1.1 km /h
BUT I AM NOT SURE OF THIS ANSWER

Answer 2

Hey there!

Let speed of stream = x km/h

∴ Downstream speed = (15+x) km/h

∴ Upstream speed = (15-x) km/h

∴ 30/(15+x) + 30/(15-x) = 4 1/2

→ 900/225-x² = 9/2

→ 9x² = 225

→ x² = 25

→ x = 5

∴ Speed of stream = 5 km/h

Hope it Helps You!