Question

Three electronic devices make a beep after every 48 seconds, 72 seconds and 108 seconds respectively. They beeped together at 10 a.m. The time when they will next make a beep together at the earliest is

Answer 1

Answer:

5 : 12 p.m.

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.

Answer 2

Answer:

i hope you like the answer

Step-by-step explanation:

Required time = LCM of 48, 72 and 108 seconds  

∴ LCM = 2 × 2 × 2 × 2 × 3 × 3 × 3 = 432 seconds = 7 minutes 12 second

∴ Required time = 10 a.m. + 7 minutes 12 second = 10 : 07 : 12 hours