: choose the correct answer. four different electronic devices make a beep after every 30 minutes 1 hour 3/2 hour and 1 hour 45 minutes respectively. all the devices beeped together at 12 noon. they will again beep together at:
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next day 9 in the morning.
the time interval has to be common multiple of 0.5 (30 minutes), 1, 1.5 (3/2 hours) and 1.75 (1 hour and 45 minutes) common multiple is 21, that is after 21 hours
the time interval has to be common multiple of 0.5 (30 minutes), 1, 1.5 (3/2 hours) and 1.75 (1 hour and 45 minutes) common multiple is 21, that is after 21 hours
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