Facing 145kmph speed ball

Two tall buildings are 40m apart A ball thrown horizontally from a window 145m above the ground in one building is to enter a window 22.5m above the ground in the other building. The speed of the ball should be

A car covers four successive 6 km streches at speed of 25 kmph, 50kmph, 75 kmph and 150kmph respectively. Its average speed over this distance is

Arjun takes 5 hrs to swim a upstream of 40km where as he takes only 2 hrs to swim downstream of 24km. Find the speed in still water. A)15 kmph B)10 kmph C)12kmph D)9kmph

A person travels from P to Q at a speed of 40 kmph and returns by increasing his speed by 50%. What is his average speed for both the trips ?

If Lalitha leares home and drives to her school at a speed of 45kmph, she reaches 5 minutes later than when she drives at 60kmph speed. Find the distance to her school (in km).

If Lalitha leares home and drives to her school at a speed of 45kmph, she reaches 5 minutes later than when she drives at 60kmph speed. Find the distance to her school (in km).

If a boat goes 7 km upstream in 42 minutes and the speed of the stream is 3 kmph, the speed of the boat in still water is :