Question

the traffic lights at three different road crossings change after every 48 seconds, 72 seconds and 100 seconds. if they start changing simultaneously at 8:00 a.m.,after how much time will they change again Simultaneously
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Answer 1

Answer:

Answer:

8.07.12 am

Step-by-step explanation:

Find the Prime Factors:

48 = 2⁴ x 3

72 = 2³ x 3²

108 = 2² x 3³

Find the LCM:

LCM = 2⁴ x 3³

LCM = 16 x 27 = 432

Convert 432 seconds to mins:

432 seconds = 432 ÷ 60 mins

432 seconds = 7.2 mins

7.2 mins = 7 mins 12 seconds

Find the time it will change together again:

8 am + 7 mins 12 seconds = 8.07.12 am

Answer: It will change together again at 8.07.12 am

Step-by-step explanation:

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Answer 2

Answer:

3600(1 hour),at 9:00 a.m

Step-by-step explanation:

for this we have to find the LCM of these numbers,the LCM of 48,72 and 100 is 3600.

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