Question

Question 33.....rs agrawal

Answer 1

Step-by-step explanation:

L.C.M of 48, 72, 108 = 2 x 2 x 2 x 2 x 3 x 3 x 3 = 432 sec.

After 432 seconds, the lights change simultaneously.

432 second = 7 minutes 12 seconds

Therefore the time = 7 a.m. + 7 minutes 12 seconds

= 7:07:12 a.m.

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Answer 2

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MATHS

The traffic lights at three different road crossing change after every 48 seconds, 72 seconds and 108 seconds respectively.If they change simultaneously at 7 : 00 a.m, at what time will they change simultaneously again? 

December 20, 2019Sharvari Modak

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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

Hope it will help you