A boat goes 8 km in 1 hr along the stream and 2 km in 1 hr against the stream. The speed in Km/hr of the stream is
Answer & explanation
Correct answer: option 3
Speed of boat in still water - x
Speed of stream/current - y
According to the question:
Upstream speed i.e. x - y = 2 km/hr -----(1)
Downstream speed i.e. x + y = 8 km/hr ------(2)
Speed of stream i.e. y = ?
Subtracting (1) from (2)
x + y - x + y = 8 - 2
2y = 6
y = 3 km/hr