A number theory problem by Parandhaman Velkuru
Number Theory
Level
pending
the speed of motor increases from 1200rpm to 1800rpm in 20 sec . how many revolutions does it make in this period of time?
100
600
300
200
500
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1 solution
Without going very technical, during those 20 seconds the average speed of the motor will be 1500rmp, so in a third of a minute (20 seconds) it will make 500 revolutions.