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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.
A
$750km/hr$
B
$50km/hr$
C
$100km/hr$
D
$150km/hr$
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Correct option is A)
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