Three wheels can complete 60, 36
and 24 revolutions per minute. 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) 5/2 s
(b). 5/3 s
(c). 5 s
(d). 7.5 s
Three wheels can complete 60, 36, 24
revolutions per minute. Three
wheels can complete 1, 0.6, 0.4 revolutions
per second. Time
to complete one revolution - 1, 5/3, 5/2 secs. LCM
of 1, 5/3 and 5/2 is 5. After 5
mins,
all these spots will simultaneously touch the ground
again