Question

There is a string of red and blue lights strung around a window. The red lights blink every 3 seconds, and the blue lights blink every 5 seconds. How many times will they blink at the same time in one minute

Answer 1

Answer:

4 times

Step-by-step explanation:

lcm of 3,5 is 15

so they will blink together every 15 secs

60/15 is 4

hope this helps

mark as brainliest pls

Answer 2

Answer:

6:10

9:15

12:20

15:25

18:30

21:35

24:40

27:45

30:50

33:55

36:60

Step-by-step explanation:

11 times