LILL
LC Wall Caduy.
Four bells ring at the intervals of 10, 15, 20 and 25 minutes. At what time they will ring
together if they ring at 7 AM?
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Answer:
Correct option is
A
12 hr 2 min.48 sec.
4=2×2
6=2×3
8=2×2×2
14=2×7
LCM of 4,6,8,14=2×2×2×3×7=168 seconds
= Bells will ring again 2 minutes 48 seconds after 12 O'clock
=12 hours 2 minutes 48 seconds.
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