Find the speed of a boat in still water if the boat goes 12 km/h along the stream and 4 km/h against the stream.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 8 km/h.
Let the speed of the boat in still water be x km/h
Let the speed of the stream = y km/h
So,
Upstream speed = x - y
Downstream speed = x + y
Given,
x - y = 4 and x + y = 12
Adding both the speeds we get,
2x = 16 and x = 8
Hence,
Speed of boat in still water = 8 km/hr