Three wheels can complete 40, 24 and 16 revolutions per minutes respec – McqOptions

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1.	Three wheels can complete 40, 24 and 16 revolutions per minutes 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.	${\text{7}}\frac{1}{2}$$ sec.
B.	8 sec.
C.	$7\frac{1}{2}$$ min.
D.	8 min.
Answer» B. 8 sec.

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