Chapter CSB1.3, Problem 23E

To determine

Time after which both light strands blinks together.

Answer to Problem 23E

Both light strands will blink together after $T=12\text{s}$

Explanation of Solution

Given:

The red light strands blink every 4 seconds.

The green light strands blink every 6 seconds.

Since,

The red light strands blink every 4 seconds and the green light strands blink every 6 seconds.

So, the time after which both strands will blink blink together is

  $\begin{array}{l}T=LCM\left(4,6\right)\\ \Rightarrow T=12\text{s}\end{array}$

Therefore, both light strands will blink together after $T=12\text{s}$