Q151
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.
sec.
AnswerB.
18 sec.
C.
min.
D.
18 min.
Answer: Option A
Solution
Answer: Option A
Solution:
For one complete revolution, the first, second and third wheels takeTime taken for all red spots to touch the ground again simultaneously.