6 Traffic signal- problem solving Two traffic lights at two different road Crossings change after every 60 seconds and - Maths - Playing with Numbers

Question

6 Traffic signal- problem solving
Two traffic lights at two different road Crossings change after
every 60 seconds and 80 seconds, respectively If they change
simultaneously at 09:00:00 hours , when will they change again
simultaneously

Aruna · Answer

We have ot find the LCM of 60 and 80 seconds
60 = 2 * 2 * 3 * 5
80 = 2 * 2 * 2 * 2 * 5
LCM = 2* 2 * 2 * 2 * 3 * 5 = 240
240 seconds = 4 minutes
After every 4 minutes they will change simultaneaously
Again they will change simultaneously at 9 :04

6.Traffic signal- problem solving. Two traffic lights at two different road Crossings change after every 60 seconds and 80 seconds, respectively. If they change simultaneously at 09:00:00 hours , when will they change again simultaneously.

6.Traffic signal- problem solving.
Two traffic lights at two different road Crossings change after every 60 seconds and 80 seconds, respectively. If they change simultaneously at 09:00:00 hours , when will they change again simultaneously.