Grade 12th pass8 grade maths
Four different electronic devices make a beep after every 30 minutes, 1 hour, 112 hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at :
(a) 12 midnight
(b) 3 a.m.
(c) 6 a.m.
Four different electronic devices make a beep after every 30 minutes, 1 hour, 112 hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at :
(a) 12 midnight
(b) 3 a.m.
(c) 6 a.m.
