Question

On MG road, three consecutive traffic lights change after 36, 42 and 72 seconds. If the lights are first switched on at 9:00am, at what time will they change simultaneously​

Answer 1

Answer:

LCM = 2 ×2 × 2 × 3 × 3 × 7 = 504 seconds. Hence, the lights will change simultaneously after 8 minutes and 24 seconds.

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Answer 2

Answer:

Here, the question asks us 'at what time will they change simultaneously', which means that we need to find LCM.

36 = 2×2×3×3

42 = 2×3×7 722×2×2×3×3

So, LCM 2×2×2×3×3×7

So, LCM 504

Thus, the lights change after every 504 seconds.

And 504 s 8 min 24 sec

So, the traffic lights will change again at 09:08:24 am

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Step-by-step explanation:

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