Question

the traffic lights at three different road crossing change after every 45 sec 60 sec 75 sec respectively if they changes simultaneously at 7 am at what time they will change simultly again'​

Answer 1

The trafic lights at three different road crossing change after

= 45 sec, 60 sec and 75 sec

They change simultaneously at 7:00 a.m.

To find out at what time the three traffic lights will change simultly again than we need to find the L.C.M of 45, 60 and 75

L.C.M of 45, 60 and 75

= 900 sec

Therefore, the traffic lights will simultaneously change after 900 seconds.

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Answer 2

Answer:

The traffic lights will change simultaneously again after 900 seconds.