Exercise 1

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    6.A and B start running from same point in the same direction at a circular field.A takes 20 sec and B takes 30 sec to complete a round.When will A and B meet again at the starting point.


    A completes First round in 20 seconds
    Second round in 40 seconds

    Third round in 60 seconds
    So 20,40,60,80….

    B completes first round in 30 seconds
    Second round in 60 seconds

    So 30,60,90….

    From Both series we can observe at 60 seconds both will reach the starting point

    Or in short L.C.M(20,30)=60