Problems on H.C.F and L.C.M
The least positive integer which is a perfect square and also divisible by each of 6,12, 18 and 24?

148
141
152
144

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Problems on H.C.F and L.C.M
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 they again change

7:25:14 hrs
8:27:12 hrs
9:22:08 hrs
10:13:17 hrs

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