7. 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?
Answers
Answer:
07:07:12 i.e. 7 mins 12 secs after 7 a.m.
Step-by-step explanation:
The traffic lights will flash together again after an interval of time which is divisible by 48, 72 and 108 s.
Hence, we need to find the least common multiple of 48, 72, 108.
LCM(48,72,108) = 432
432 s = 7 mins 12 secs.
∴ The 3 traffic signals will flash together 7 mins 12 secs after 7 a.m. i.e. at 07:07:12 (Ans.)
Answer:
find lcm of three numbers and that would be your answer
so it will blink at 7:07:12 or in 7 min and 12 sec after 7.
Step-by-step explanation:
first i took lcm of both the three numbers which is 432 ......and all three values completely devides this number....so 432 sec will be referred as 7 min and 12 sec (432/60 for minute converion)..
mark me as brainliest ;)