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7 September, 04:54

The traffic lights at three different road crossing change after every 48 secs, 72 secs and 108 secs respectively. If they change simulatenously at 7 a. m. at what time will they change simulatenouslyagain

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  1. 7 September, 05:00
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    48 = 2 * 2 * 2 * 2 * 3

    72 = 2 * 2 * 2 * 3 * 3

    108 = 2 * 2 * 3 * 3 * 3

    LCM (48; 72; 108) = 432

    432 secs = 7,2 min. = 7 min. 12 secs

    7 a. m. + 7 min. 12 secs = 7:07:12 a. m. - answer.
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