If a man walks 1 km/hr faster than his usual speed then he covers a distance of 3 km in 15 minutes less time. Find his usual speed.

A man can walk 8 km in 1 hour 15 minutes .Find his speed.

A person takes 40 minutes more than his usual time when he covers a distance of 20 km at 5 km/h.If he covers the same distance at 8 km/h, he takes x minutes less than the usual time. Whatis the value of x ?

A cyclist covers 1.5 km in 5 minutes. Find his speed in km/hr.

By walking at (3)/(4) of his usual speed,a man reaches his office 20 minutes later than his usul time.Find the usual time taken by him to reach his office.