Question

The Baldwin family walked four over five of a mile in four over nine of an hour. What is their unit rate in miles per hour?

A. four-ninths over four-fifths equals four over nine mile per hour
B. four-fifths over four-ninths equals one and four-fifths miles per hour
C. four-ninths over four-fifths equals one and four-fifths miles per hour
D. four-fifths over four-ninths equals four over nine mile per hour

Answer 1

B, four-fifths over four ninths

Answer 2

Answer: Option 'B' is correct.

Explanation:

Since we have given that

Number of miles the Baldwin family walked is given by

`(4)/(5)\ miles`

Number of hours the Baldwin family walked is given by

`(4)/(9)\ hour`

So, we need to find the unit rate in miles per hour.

`Speed=(Distance)/(time)\\\\Speed=((4)/(5))/((4)/(9))\\\\Speed=(9)/(5)=1(4)/(5)\ mph`

Hence, Option 'B' is correct.