In 1 hour, a boat goes 11 km along the stream and 5 km against the stream. The speed of the boat in still water (In km/hr) is
Answer & explanation
Correct answer: option 4
Speed of boat in still water - x
Speed of stream/current - y
According to the question:
Upstream speed i.e. x - y = 5 km/hr -----(1)
Downstream speed i.e. x + y = 11 km/hr ------(2)
Speed of boat in still water i.e. x = ?
Adding both the equations, we get:
x + y + x - y = 5 + 11
2x = 16
x = 8 km/hr