Crossing River In Minimum Time

Show that a boat must move at an angle with respect to river water in order to cross the river in minimum time .

Assertion: To cross the river in minimum time swimmer should swimming in perpendicular direction to the water current. Reason: In this case river flow helps to cross this river.

Assertion: To cross the river in minimum time swimmer should swimming in perpendicular direction to the water current. Reason: In this case river flow helps to cross this river.

Assertion: To cross the river in minimum time swimmer should swimming in perpendicular direction to the water current. Reason: In this case river flow helps to cross this river.

A man crosses a river in a boat. If he cross the river in minimum time he takes 10 min with a drift 120 m. If he crosses the river taking shortest path, he takes 12.5 min, find (a) width of the river (b) velocity of the boat with respect to water (c) speed of the current

A man crosses a river in a boat. If he cross the river in minimum time he takes 10 min with a drift 120 m. If he crosses the river taking shortest path, he takes 12.5 min, find (a) width of the river (b) velocity of the boat with respect to water (c) speed of the current

A man crosses a river in a boat. If he cross the river in minimum time he takes 10 min with a drift 120 m. If he crosses the river taking shortest path, he takes 12.5 min, find (a) width of the river (b) velocity of the boat with respect to water (c) speed of the current

A man crosses a river in a boat. If he cross the river in minimum time he takes 10 min with a drift 120 m. If he crosses the river taking shortest path, he takes 12.5 min, find (a) width of the river (b) velocity of the boat with respect to water (c) speed of the current