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/hr from the usual speed. Its usual speed is:

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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/hr from the usual speed. Its usual speed is: