Question 55

The traffic lights at three different road crossings change after every 48 sec., 72 sec. and 108 sec., respectively. If they all change simultaneously at $$8 : 20 : 00$$ hours, then at what time will they again change simultaneously ?

Solution

L.C.M. (48,72,108) = 432

Thus, they will all change simultaneously after 432 seconds = 7 min 12 seconds

=> Time they will change  again = 8:20:00 + 00:07:12 = 8:27:12 hours

=> Ans - (C)


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