Question
A digital watch X beeps every 30 seconds while watch Y beeps every 32 seconds. They beeped together at 10 AM. The immediate next time that they will beep together is ________
Options :
10.08 AM
10.42 AM
11.00 AM
10.00 PM
Answer :
10.08 AM
Solution :
Watch X beeps at = 30 sec
Watch Y beeps at = 32 sec
They beep together at = 10.00 AM
LCM of (30 & 32) = 480 sec
And X and Y will beep together after 480 sec or 8 minutes.
So Next beep time = 10.08 AM
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