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12 March, 13:17

46 Two light houses ash their lights every 30 seconds and 40 seconds respectively. Given that they last ashed together at 10:40 A. M., when will they next ash together? (Chapter 1)

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  1. 12 March, 13:35
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    30,60,90,120

    40,80,120

    they will both " ash " in 120 seconds (thats 2 minutes) ... so they will both ash at

    10:42 a. m.
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