Question

The traffic lights at three different road crossings change after every 48 sec,72 sec,108 sec respectively. if they change simultaneously at 8:20:00 hours, then they will change again simultaneously at

Answer 1

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Answer 2

Answer:

takethe hcf of the 48 72 and 108 and then mutiply it you get 432 and then divide it by 60 and you get the ans as 12 min and 7 sec

Step-by-step explanation:

hcf of 48= 2*2*2*2*3=

hcf of 72 =  2*2*2*3*3

hcf of 108= 2*2*3*3*3

lcm of 48,72,108 =432

432/60=7min and 12sec

so the light changes at 8:27:12