a) 12:10 PM
b) 12:12 PM
c) 12:11 PM
d) 12:20 PM
Answer: d
Explanation: They will ring together after,
LCM of 48 and 50 secs.
48 = 2 × 2 × 2 × 2 × 3;
50 = 2 × 5 × 5
LCM = 2 × 2 × 2 × 2 × 3 × 5 × 5 = 1200 secs
= 20 min.
They will beep together at 12:20
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