Two simple pendulums of length `100m` and `121m` start swinging together. They will swing together again after

Two simple pendulums of length 100 m and 121 m start swinging together in the same directionvith same phase.They will swing together again in same phase after.

Two simple pendulums of lengths 1.44 m and 1 m start swinging together. After how many vibrations will they again start swinging together

Two pendulums of lengths 1.69m and 1.44m start swinging togther. After how many vibrations will they again start swinging togther?

Two simple pendulums of lengths 100 cm and 144cm start oscillating together at time t = 0. The minimum time after which they swing together is (take g=pi^(2)ms^(-2) )

Two simple pendulums of lengths 1.21m and 1.00 m start swinging at the same time from a location. After how much time, they will be (a) out of phase and (b) in phase again? Take g=10m//s^(2) .