A plane left 40 minutes late due to bad weather and in order to reach its destination, 1600 km away in time, if had to increase its speed by 400 km/h from its usual speed. Find the usual speed of the plane :

A plane left 30 minutes later than the scheduled time and in order to reach the destination 1500 km away in time, it had to increase the speed by 250 km/h from the usual speed. Find its usual speed.

A plane left 30 minutes late than its scheduled time and in order to reach the destination 1500km away in time,it had to increase the speed by 250km/h from the usual speed.Find its usual speed.

An aeroplane takes off 30 minutes later than the scheduled time and in order to reach its destination 1500 km away in time , it has to increse its speed by 250km/h from its usual speed . Find its usual speed .

A plane left 30 min later than its scheduled time to reach its destination 1500 km away. In order to reach in time it increases its speed by 250 km/h. What is its original speed?

While boarding an aeroplane,a passenger got hurt.The pilot showing promptness and concern,made arrangements to hospitalise the injured and so the plane started late 30 minutes to reach the destination,1500km away in time,the pilot increased the speed by 100km hr.Find the original speed/hour of the plane.