[" Example "22" ."A" boat starts from a part at "3" o'clock with a speed of "20km" towards South.Another boat "],[" sailing with a speed of "15km/h" towards east reaches the port at "4o'" clock.At what time will they be "],[" nearest? "]

A boat travels upstream at the speed of 20 km/h and downstream at the speed of 30 km/h. What is the speed of the boat.

A river has width 0.5 km and flows from West to East with a speed 30 km/hr. If a boatman starts sailing his boat at a speed 40 km/hr normal to bank, the boat shall cross the river in time –

A body is travelling due east at a speed of 15km/h for one hour and then turns towards south at a speed of 10km/h for one hour. Find the average velocity of the body.

A boat covers a distance of 14 km in 4 hours along the flow. What is the speed of the boat in still water, if the speed of the flow of water is 2 km/h?

Suppose a car starts from a place A and travels at a speed of 40 km/h towards another place B. At the same instance, another car starts from B and travels towards A at a speed of 30 km/h. If the distance between A and B is 100 km, after how much time will the cars meet?

Two friends X and Y start from a place A, X moves 20 km towards South and Y moves 15 km towards East. The shortest distance between X and Y is _______ .

A car is moving towards east with a speed of 25 km h^-1 . To the driver of the car, a bus appears to move towards north with a speed of 25 sqrt(3) km h^-1 . What is the actual velocity of the bus ?