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5th Class Mathematics Factors and Multiples Question Bank Factor & Multiple

  • question_answer
    Three City buses leave the bus stop at 9.00 A.M. Bus A returns in every 30 minutes, Bus B returns in every 20 minutes and bus C returns in every 45 minutes. At what time all the buses will all return at the same time to the bus stop?

    A)  1 : 00 PM                    

    B)  12 : 00 Noon

    C)  7 : 00 PM                    

    D)  11 : 30 PM

    Correct Answer: B

    Solution :

     L.C.M. of 30, 20, 45
    5 30, 20, 45
    3 6, 4, 9
    2 2, 4, 3
    1, 2, 3
    \[5\times 3\times 2\times 2\times 3=180\]Minutes\[=3\]Hours Time\[=9:00+3=12:00\]


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