In how much time will a train 250 m long, running at 50 km/hr pass a man, running at 5 km/hr in the same direction in which the train is going?

A boy of mass 50 kg running at 5ms^-1 jumping a trolly of 20 kg travelling in the same direction 1.5 ms^-1 . Find their common velocity.

A man rowing at the rate of 5 km per hour in still water takes thrice, as much time in going 40 km up the river as in going 40 km down. Find the rate at which the river flows.

A train is moving at a uniform speed of 75 km/hour : Find the time required to cover a distance of 250 km.

A train 100 m long is moving with a velocity of 60 kmh^-1 . Find the time it takes to cross the bridge 1 km long.

The radius of curvature of a railway line at a place is 40000m.the train is running at 20 m s^-1 .the distance between the two rails is 1.5 m.Find the elevation of the outer rail over the inner one so that the train may be able to run safely.

Two parallel rail tracks run north-south. Train A moves north with a speed of 54 km h^-1 and train B moves south with a speed of 90 km h^-1 .Velocity of a monkey running on the roof of the train A against its motion (With a velocity of 18 km h^-1 with respect to the train A) as observed by a man standing on the ground?

The speed of a boat in still water is 10 km/hr. If it can travel 26 km downstream and 14 km upstream in the same time, find the speed of the stream.

Points A and B are 90 km apart from each other on a highway. A car starts from A and another from B at the same time. If they go in the same direction they meet in 9 hours and if they go in opposite direction they meet in 9/7 hours. Find their speeds.