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

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

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Problems on H.C.F and L.C.M
Find the smallest number of two digits which on being divided by 2, 3, 4 and 5 leaves 0, 1, 2 and 3 as remainder respectively.

61
58
65
55

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Problems on H.C.F and L.C.M
An electronic device makes a beep after every 60 sec. Another device makes a beep after every 62 sec. They beeped together at 10 a.m. The time when they will next make a beep together at the earliest,

10 : 31 am
12 : 31 am
11 : 31 am
9 : 31 am

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