River Boat Problem

Two boats A and B having same speed relative to river are moving in a river. Boat A moves normal to the river current as observed by an observer moving with velocity of river current. Boat B moves normal to the river as observed by the observer on the ground.

Drift is distance along a river a boat covers in crossing the river. If the boat reaches point C, distance BC is called downstream drift and if the boat reaches point D, distance BD is called upstream drift. To cross a river without drift, what should be relation between v_(br) and v_(r) . If a boat crosses a river without drift, in which direction must it be steered.

A boat is rowed across a river at the rate of 4.5(km)/(hr) . The river flows at the rate of 6(km)/(hr) . The velocity of boat in (m)/(s) is:

A river of width omega is flowing with a uniform velocity v. A boat starts moving from point P also With velocity v relative to the river. The direction of resultant velocity is always perpendicular to the line joining boat and the fixed point R. Point Q is on the opposite side of the river. P, Q and R are in a straight line. If PQ=QR=omega, find (a) the trajectory of the boat, (b) the drifting of the boat and (c) the time taken by the boat to cross the river.

Two persons P and Q crosses the river starting from point A on one side to exactly opposite point B on the other bank of the river. The person P crosses the river in the shortest path. The person Q crosses the river in shortest time and walks back to point B. Velocity of river is 3 kmph and speed of each boat is 5 kmph w.r.t river. If the two persons reach the point B in the same time, then the speed of walk of Q is

A,B and C are three persons who can row their boats with speeds 10 m/s 7 m/s and 3 m/s respectively in still water Velociy of flow of water in a river is 7 m/s All start rowing their boats upstream then

A boat which travels at the rate of 10.5 km/hr downstream takes 3 times as long time to go to a certain distance up a river as to go the same distance down. Find the rate at which stream flows.

A river is flowing towards with a velocity of 5 m s^-1 . The boat velocity is 10 ms^-1 . The boat crosses the river by shortest path. Hence,

A river is flowing towards with a velocity of 5 m s^-1 . The boat velocity is 10 ms^-1 . The boat crosses the river by shortest path. Hence,

A boat moves relative to water with a velocity which is 'n' times the river flow a) If n lt 1 boat can not cross the river b) If n = 1 boat can not cross the river without drifting c) If n gt 1 boat can cross the river along shortest path d) Boat can cross the river what ever is the value of n excluding zero value