Question

The traffic lights at three different road crossings change after every 42 seconds and 56 seconds and 63 seconds respectively. If they change simultaneously at 9 : 30 : 00 hours , then and what time will they again change simultaneously.​

Answer 1

Answer:

Consider the problem

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

So,

48=2×2×2×2×3

72=2×2×2×3×3

108=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

=

60

432

minutes

∴Time=7 minutes12 seconds

Thus,

Required time =7am+7minutes 12seconds

=7:07:12am

Step-by-step explanation:

tq

Answer 2

Answer:

hi

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myself kanishka

class 10 th