Question

two traffic lights blink at an interval of 40 and 60 seconds respectively after how many minutes will they blink together​

Answer 1

Answer:

120 sec or 2 minutes

Step-by-step explanation:

net net traffic light blink together equal to do LCM of their time interval

2| 60,20

2| 30,20

5| 15,10

| 3,2

LCM= 2*2*2*5*3

=15*8

=120

hence time interval =120sec or 2 minutes