A plane left 30 minutes later than the scheduled time and in order to reach its destination 1500kmph away in time, it has to increase its speed by 250kmph from its usual speed. Find its usual speed.
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Solution
Let the usual speed of the plane be xkmph ,then
Time taken to cover 1500km with the usual speed=1500xhrs
Time taken to cover 1500km with the speed of (x+250)kmph=1500x+250