Three wheels can complete 60, 36 and 24 revolutions per minute respect – McqOptions

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1.	Three wheels can complete 60, 36 and 24 revolutions per minute respectively. There is a red spot on each wheel that touches the ground at time zero. After how much time, all these spots will simultaneously touch the ground again.
A.	2.5 sec
B.	5 sec
C.	6 sec
D.	7.5 sec
Answer» D. 7.5 sec

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