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,

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

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Problems on H.C.F and L.C.M
A, B and C start running around a circular stadium and complete one round in 27 s, 9 s and 36 s, respectively. In how much time will they meet again at the starting point?

3 minute 48 seconds
2 minute 48 seconds
4 minute 48 seconds
1 minute 48 seconds

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