
If two similar waves are traveling in the same medium, then they have same wave velocity. so we can infer that

Now, as per the formula ~ we know that :

Now, we can write it as :

And it's also given that frequency of wave A is 3 times that of frequency of wave B.
So, let's add the relation to our equation ~



So, choice C is correct ~
It seems that you have missed the necessary options for us to answer this question, so I had to look for it. Anyway, in "The First Seven Years" by Bernard Malamud, the character's <span> life lesson that conveys the story’s main idea is FELD. Hope this answers your question.</span>
You can but it is best not to
Explanation:
45 because I got the answer
He is 73 years old
Explanation: He is also 73 years old