(d) The green light of a crossing goes on and off every 15 seconds and that of the next crossing goes on and off after every 20 seconds

Question

(d) The green light of a crossing goes on and off every 15 seconds and that of the next crossing goes
on and off after every 20 seconds. If they were lighted together at 4 a.m. when will they again go
on together?

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Parker 1 month 2021-08-13T16:57:41+00:00 1 Answer 0 views 0

Answers ( )

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    2021-08-13T16:59:29+00:00

    Answer:

    the first light will go on at 4:15am and the second loght will go on at 4:20 am

    hope you like my answer have a great day

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