The traffic lights at three different road crossings change after every 48 seconds, 72 seconds, and 144 seconds respectively. If they change simultaneously at 7:00 am, at what time will they change simultaneously again?
7:02 am
7:02:12 am
7:02:24 am
7:03 am
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Answer:
really
Step-by-step explanation:
ok what the name
weaired it was
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Answer:
Consider the problem
The traffic light at three different road crossing change after every 48seconds,72seconds and 108seconds respectively
So,
48=2×2×2×2×372=2×2×2×3×3108=2×2×3×3×3
Therefore, L.CM of 48,72,108 is
(2×2×2×2×3×3×3)=432
So, time when they change again =432seconds
But we need to find time after 7am So, first we convert 432seconds into minutes.
Time=432second=60432minutes∴Time=7 minutes12 seconds
Thus,
Required time =7am+7minutes 12seconds
=7:07:12am
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