Question

Two traffic lights both turn green at 1:20 pm. One light is on a 72-second 0cycle from green back to green while the other light is on a 1-minute cycle. After how many minutes will they again turn green together?

Answer 1

32

Explanation:

Answer 2

6 minutes

Explanation:

1 minute = 60 seconds

LCM of 60 and 72 = 360

360 seconds = 6 minutes