Question

The traffic light at three different signals point change after every 45 sec , 75 sec ,90 sec respectively . it all changes simultaneously at 7:20:15 hours then they will change again simultaneously.​

Answer 1

Answer:

Correct option is

B

7:27:45 hours

LCM of 45,75 and 90=450 seconds.

i.e. 7 minutes 30 seconds.

∴ Required time =7:27:45 hours.