Question

Water is flowing in a stream with velocity 5 km/hr in an easterly direction relative to the share. Speed of a boat is relative to still water is 20 km/hr. If the boat enters the stream heading North, with what velocity will the boat actually travel?Ans. ′

Answer 1

Velocity of the boat moving North = 15 Km/hr.

Explanation:

Given: Velocity of the stream = 5 Km/hr East

Velocity of boat in still water = 20 Km/hr

Find: Velocity of boat heading north.

Solution:

We find that u = 5 Km/hr east and v = 20 km/hr.

If the boat is moving northward, then we find that it is moving upstream.

So velocity of the boat moving upstream = v - u = 20 - 5 = 15 Km/hr.