Question

4 traffic signals change after interval of 8 mins,10mins,12mins and 15mins.If they changed together at 1 pm,at what time next will they again change together.​

Answer 1

Step-by-step explanation:

LCM of 8,10,12,15. is

2×. 4,5,6,15

3×. 4,5,2,5

2×. 2,5,1,5

5×. 2,1,1,1

2×. 1,1,1,1,

120

1pm after 120 min

so at 3pm

Answer 2

Answer:

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