Question #0ef49

1 Answer
Mar 6, 2016

Whenever you encounter the word "per", think of it as "divided by" to get the right units in the numerator and denominator.


The question asks "how many miles", so we want the final answer to have units of "miles".

70.5 miles per hour can be written as 70.5 #("miles")/("hour")#.

From these two considerations, you can see that the proper thing to do is to multiply the two pieces of information so that the "hours" units cancel (one in the numerator and one in the denominator):

#70.5 ("miles")/("hour") times 8.73 " hours" = 615 " miles"#