Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?

The average human heart beats at 72 times per minute. How many times does it beat in 15 seconds? How many in an hour?

An aeroplane leaves an airport and flies due north at a speed of 1000 kmph. At the same time another aeroplane leaves the same airport and flies due west at a speed of 1200 kmph. How far apart will the two planes be after 1 1/2 hour?

A bus travelled 300 km in (7)1/2 hours with uniform speed find how many km it travelled in 1 hour?