Time Speed And Distance

A train 220 m long in moving at 54 km/h. Time taken by it to cross a person running in the same direction with speed of 18 km/h is:

If a man increases his speed to times his usual speed, he reaches his office 24 minutes before the office time. Find the time taken by to reach his office with usual speed.

A journey takes 35 minutes while moving with a speed of 32 km/h. How long would the journey take (in minutes) moving at a speed of 40 km/h?

A man covers a distance of 12km by walking at a speed of 4km/h. How much distance (in km) would he cover in the same time, if he walks at a speed of 6 km/h ?