A train travels for 30 minutes with a velocity of 54 km/h and then for 120 minutes with a velocity of 72 km/h in the same direction. Calculate the average velocity of the train.
15 m/s = ___.(in km/hr)
A motorbike travels 220 km in 5 litres of petrol. How much distance will it cover in 1.5 litres of petrol?