To take the boat away from the bank of a river, the boatman pushes the bank with an oar. Why?

A boat is pushed away from the river bank when a sailor jumps from the boat to the bank. Why?

The river 500 m wide is flowing with a current of 4kph. A boat starts from one bank of the river wishes to cross the river at right angle to stream direction. Boatman can row the boat at 8 kph. In which direction he should row the boat. What time he ''ll take to cross the river ?

A man standing on the bank of a river observes that the angle of elevation of the top of a tree just on the opposite bank is 60^(@) . The angle of elevation is 30^(@) from a point at a distance y m from the bank of the river. What is the height of the tree ?

The site of Harappa is located on the bank of river

Badrinath is located on the bank of which river?

When a sailor jumps from a boat to the river bank?