The wheels revolve round a common horizontal axis. They make 15, 20 – McqOptions

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1.	The wheels revolve round a common horizontal axis. They make 15, 20 and 48 revolutions in a minute respectively. Starting with a certain point on the circumference down wards. After what interval of t
A.	1 min
B.	2 min
C.	3 min
D.	None
Answer» B. 2 min

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