The velocity of water in a river is less on the bank and large in the middle : why?

Give reason for the following: (a) Machine parts get jammed in the winters. (b) A constant driving force is always required for the maintenance of the flow of oil through pipe lines in the refineries. (c) Velocity of water in a river is less near the banks and more in the middle.

Why is the velocity of water is large in the middle and less near the bank?

A person reaches on a point directly opposite on the other bank of a river.The velocity of the water in the river is 4 m//s and the velocity of the person in still water is 5 m//s .If the width of the river is 84.6m , time taken to cross the river in seconds is

A person reaches on a point directly opposite on the other bank of a river.The velocity of the water in the river is 4 m//s and the velocity of the person in still water is 5 m//s .If the width of the river is 84.6m , time taken to cross the river in seconds is

The velocity of water in a river is 2 kmph, while width is 400 m. A boat is rowed from a point rowing always aiming opposite point at 8 kmph of still water velocity. On reaching the opposite bank the drift obtained is

The velocity of water in a river is 2 kmph ,while width is 400 m . A boat is rowed from a point rowing always aiming opposite point at 8 kmph of still water velocity. On reaching the opposite bank the drift obtained is

The velocity of water in a river is 2 kmph ,while width is 400 m . A boat is rowed from a point rowing always aiming opposite point at 8 kmph of still water velocity. On reaching the opposite bank the drift obtained is