Question

Three wheels can complete 60,36,24 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?​

Answer 1

Answer:

Correct answer is 6s

Time taken to complete one resolution by

60

First wheel = s = 1s 60

36 3

Second wheel = 60

24 2

Third wheel = 60

:Required time = LCM of (1,55

LCM of 1,3,2

LCM of 1,5,5

6/1=6s