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Two ball A and B rotate along a circular track.Ball a makes 2 full rotations in 26 min .Ball b makes 5 full rotations in 35 min.if they start rotating now from same point,when will they be at the same starting point agin.

1 hr 31 min
1 hr 45 min
1 hr 57 min
1 hr 52 min

Read Solution (Total 3)

A makes 2 full rotations in 26 min => 1 full rotation in 13 min

B makes 5 full rotations in 35 min => 1 full rotation in 7 min

they will be at the same starting point again after LCM(13,7)= 91 minutes
= 1 h 31 min
10 years agoHelpfull: Yes(27) No(0)

BUT Y L.C.M ?? does ds happn in all cases?? @rakesh
10 years agoHelpfull: Yes(2) No(0)
@Priya We take L.C.M because it is the Least position where two numbers have common multiple.
10 years agoHelpfull: Yes(2) No(0)

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