Two boys A and B are at a distance 1360 ...

Two boys A and B are at a distance 1360 m apart .Boy B clapped, at the same time boy A released the bob of pendulum from its extreme point. Boy A hears the clapping when Bob reaches first time at its initial position. The time taken by pendulum to oscillate 45 times is (Take speed of sound = 340 m/s.)

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