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A blue bulb keeps flashing on the interval of every 60 seconds and a red bulb keeps flashing on the interval of every 90 seconds. If both the bulbs are switched on at 5 “O” clock together then after how much time both will flash together?

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According to question both bulbs are switched on at 5 “O” clock.

Thus, after 180 seconds, 180 + 60 = 3 min. i.e., at 5 : 03 both bulbs will flash together.

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