urgent!!!! The traffic lights at three different road crossings change after every 48 seconds, 72 seconds and 108 seconds respectively. If they change simultaneously at 7 a.m. at what time will they change simultaneously again?

urgent!!!! The traffic lights at three different road crossings change

1.	urgent!!!! The traffic lights at three different road crossings change after every 48 seconds, 72 seconds and 108 seconds respectively. If they change simultaneously at 7 a.m. at what time will they change simultaneously again?
Answer» hat traffic light at three different road crossing change after EVERY 48 seconds,72 seconds and 108 seconds RESPECTIVELY. Hence,after 7 min and 12 seconds they will blink SIMULTANEOUSLY. ... If at some point they were changing simultaneously, they will CONTINUE to do so every 432 seconds Plz thank my answer