A) 5/2 seconds
B) 5/3 seconds
C) 5 seconds
D) \[7.5\]seconds
Correct Answer: C
Solution :
A makes 1 rev. per sec B makes \[\frac{6}{10}\] rev per sec C makes \[\frac{4}{10}\] rev per sec In other words A, B and C take 1 , \[\frac{5}{3}\] & \[\frac{5}{2}\] seconds to complete one revolution. L.C.M of 1, \[\frac{5}{3}\] & \[\frac{5}{2}=\frac{LC.M\,\,of\,\,1,5,5}{H.C.F.\text{ }of\text{ }1,3,2}=5\] Hence, after every 5 seconds the red spots on all the three wheels touch the groundYou need to login to perform this action.
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