Question

Three electronic devices make a beep after every 48 sec, 72 sec and 108 sec respectively. they beeps together at 10am the time when they will next make a beep together at the earliest is​

Answer 1

they make a beep together at 10 : 7 : 12 am

Step-by-step explanation:

interval of change = ( LCM of 48, 72, 108 ) = 432 sec.

so the device will again beep after every 432 sec I.e., 7 min 12 sec.

hence, next beep will take place at 10:7:12 am