### Home > ACC7 > Chapter 5 Unit 3 > Lesson CC3: 5.2.1 > Problem5-27

5-27.

To ride to school, Elaine takes $7$ minutes to ride $18$ blocks. What is her unit rate (blocks per minute)? Assuming she rides at a constant speed, how long should it take her to go $50$ blocks? Justify your answer.

Set up a fraction to find the unit rate.

$\frac{18\text{ blocks}}{7\text{ minutes}} \approx 2.57\text{ blocks per minute}$

Now find how long it should take her to go $1$ block, then find how long it should take to go $50$ blocks.

$1$ block: $(7\div18)$
$50$ blocks: $(7\div18)·50$