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19 January, 23:03

Tom and Amy set the alarms on their phones to sound at 6:45 am. Both alarms sound together at 6:45 am. Toms alarm sound every 9 minutes and Amy's alarm sounds every 12 minutes. At what time will both alarms next sound together?

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Answers (2)
  1. 20 January, 01:06
    0
    Answer is 7:21am,

    12x3=36

    9x4=36

    Hence 6:45am adding 36 mins equals to 7:21am
  2. 20 January, 01:44
    0
    After 36 min, first alarm will ring 4 times (36=4*9) and the second alarm 3 times (36=3*12)

    6.45 - 6.54 - 7.03 - 7.12 - 7.21

    6.45 - 6.57 - 7.09 - 7.21

    At 7.21 will ring together
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