a plane left 30 minutes later than the scheduled time and inorder to reach the desination, 1500km away in time. It has to increase the speed by 250km/h from the usual seed. Find the usual speed?
Let the usual speed of the plane be x km/hr.
Increased speed of the plane = (x + 250) km/hr
Time taken to reach the destination at usual speed,
Time taken to reach the destination at increased speed,
Given, t 1 – t 2 = 30 min
Thus, the usual speed of the plane is 750 km/hr.