Question

Simon can see two lights, light A and light B.

Answer 1

Answer:

2 Times

Step-by-step explanation:

Light A flashes every 15 seconds.

Light B flashes every 18 seconds.

First, we determine the next time both lights will flash together.

This is done by finding the Least Common Multiple of the two numbers.

15=3X5

18=$2X3^2$

LCM of 15 and 18=$2X3^2X5=90$

This means that both lights will flash together after 90 seconds.

Now, 4 Minutes =4 X 60 =240

240=90+90+60

Therefore, the number of times more both light will flash together in the next 4 Minutes

= 2 Times