A boat covers 12 km upstream and 18 km downstream in 3 hours, while it covers 36 km upstream and 24 km downstream in n`6 1/2` hours. find the speed of the current.

A boat covers 12km upstream and 18km downstream in 3 hours,while it covers 36km upstream and 24km downstream in n6(1)/(2) hours.find the speed of the current.

A boat covers 24 km upstream and 36 km downstream in 6 hours while it covers 36 km upstream and 24 km downstream in 6 1/2 hours. The velocity of the current is 1 k m//h r b. 1. 5 k m//h r c. 2 k m//h r d. 2. k m//h r

A boat covers 24 km upstream and 36 km downstream in 6 hours while it covers 36 km upstream and 24 km downstream in 6 1/2 hours. The velocity of the current is 1\ k m//h r b. 1. 5\ k m//h r c. 2\ k m//h r d. 2. k m//h r

A boat covers 48 km upstream and 72 km downstream in 12 hours, while it covers 72 km upstream and 48 km downstream in 13 hours. The speed of stream is :