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 1t 2 = 30 min

Thus, the usual speed of the plane is 750 km/hr.

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