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 next time, when they would beep together at the earliest is (a) 10.30 a.m.    (b) 10.31 a.m.    (c) 10.59 a.m.    (d) 11 a.m.