A plane left 30 min. later than the schedule time and in order to reach destination 1500 km away in time, it has to increase its speed by 250 km/hr from its usual speed. Find usual speed.
750km/hr
50km/hr
100km/hr
150km/hr
A
50km/hr
B
150km/hr
C
750km/hr
D
100km/hr
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