Given
Width of river = 3km/h
the velocity of the boat =5km/hr
Time is taken for shortest path = 15 mins
Find out
We have to determine the velocity of the river stream.
Solution
Boat crosses a river of width 1 km by shortest path in 15 min
v = 1 km/15 min
We will convert km/h to m/s
To convert km/h to m/s we use formula
xkm/h = x X (5/28) m/s
Hence 1km/h
= (1000/15 x 60) x (18/5) km/h
=4kmh−1
Speed of river, vr=√52−42
=3kmh−1
Tags:
Physics