A boatman rows 96 km downstream in 8 hours with a stream speed of 4kmph. How much time will he take to cover 8km upstream?

1 Hr 2Hr 3 Hr 6 Hr

2Hr

Downstream speed i.e. x + y =  \(\frac{96 }{ 8}\) = 12 km/hr Speed of stream i.e. y = 4 km/hr, Speed of boat in still water i.e. x = 8 km/hr Upstream speed i.e. x- y = 8 - 4 = 4 km/hr Time =  \(\frac{8 }{4 }\) = 2 hours