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A plane left 30 minutes later then he the scheduled time and in order to reach the destination 1500km away it time it had to increase the speed by 250km/hr from the usual speed is
Options:
A .  720km/hr
B .  730km/hr
C .  740km/hr
D .  750km/hr
Answer: Option D

Let the usual speed be x km/hr 
A Plane Left 30 Minutes Later Then He The Scheduled Time A...
=> x (x + 250) = 750000 
=> x2 +250 x “ 750x “ 750000 = 0 
=>x (x + 1000) “ 750(x + 1000) = 0 
=> (x +1000)(x-750) = 0 
=> x =750.


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