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A Plane left 30 minutes late than its scheduled time and in order to reach of destination 1500 km away in time

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A Plane left 30 minutes late than its scheduled time and in order to reach of destination 1500 km away in time, it had to increase its speed by 100 km/h from the usual speed. Find its usual speed.

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Let the speed of plane be x km/hr 

Time taken to cover 1500 km

(t1) = Distance/speed = 1500/x hr

Time taken to cover 1500 km

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