Question

An aeroplane left 50 minutes later than its scheduled time, and in order to reach the destination, 1250km away, in time, it had to increase its speed by 250km/hr from its usual speed. Find its usual speed.

Answer 1

Let the usual speed of aeroplane be x km/hr,

Then the increased speed of the aeroplane is = (x + 250) km/hr

Time taken by the aeroplane under usual speed to cover 1250 km =hr

Time taken by the aeroplane under increased speed to cover 1250 km = hr

Therefore,

Since, the speed of the aeroplane can never be negative,

Therefore, the usual speed of the train = 500 km/hr.