Traffic lights at 3 junctions A, B and C change every 15, 25 and 30 seconds respectively. If all the lights change simultaneously at 10. a.m., when will they change together apain?”

A

2 min 30 sec past 10 a.m.

B

2 min 20 sec past 10 a.m.

C

5 min 10 sec past 10 a.m.

D

5 min 20 sec past 10 a.m.