Question

7. The traffic lights at three different road crossings change after every 48 sec, 72 sec and 108 sec
respectively. If they all change simultaneously at 8:20:00 hrs then when will they again change
simultaneously at?​

Answer 1

Answer:

Given that traffic light at three different road crossing change after every 48 seconds,72 seconds and 108 seconds respectively.

48 = 2 × 2 × 2 × 2 × 3

72 = 2 × 2 × 2 × 3 × 3

108 = 2 × 2 × 3 × 3 × 3

Taking LCM for,

48, 72 and 108 i.e (2 × 2 × 2 × 2 × 3 × 3 × 3)= 432

We have,

432 seconds = 7 min 12 seconds

Hence,after 7 min and 12 seconds they will blink simultaneously.

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Answer 2

Answer:

Answer for the above question is in the following pi