In one hour, a boat goes 14 km/hr along the stream and 8 km/hr against the stream. The speed of the boat in still water in km/hr is
12 km/hr
11 km/hr
10 km/hr
8 km/hr
Explanation:
Let speed of the boat in still water = a and speed of the stream = b
Then
a + b = 14
a - b = 8
Adding these two equations, we get 2a = 22
=> a = 11
ie,speed of boat in still water = 11 km/hr