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, is  Pick one:
A) 10:28 am B) 10:30 am C) 10:31 am D) 10:37 am E) None of above
Explanation:   L.C.M. of 60 and 62 seconds is 1860 seconds     1860/60= 
<gadget id="calculator">  1860/60</gadget>
<output>31</output>
31 minutes   They will beep together at 10:31 a.m.   Sometimes questions on red lights blinking comes in exam, which can be solved in the same way   Answer: Option 10:31 am
<result>C</result>
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, is