Quoi??????????? j'ai ne pas compris...
-20 = x/8 -8) oh ya and please subscribe to iwpp
Answer:

Step-by-step explanation:
Given: A sound wave travels through iron at a rate of 
To find: rate at which the sound wave travel in 
Solution:
Use the following units conversions.


Now convert
into 
Therefore,

That looks hard sorry I don’t know answer good luck