Solve Real-World System Problems Practice Test

A rectangle has perimeter 40 cm. Its length is 3 cm more than its width. Let $l$ be the length and $w$ be the width. What are the dimensions $(l,w)$?

Two friends start biking toward each other from towns that are 54 miles apart. One bikes at 12 mph and the other bikes at 6 mph. Let $t$ be the time in hours until they meet, and let $d$ be the distance (in miles) the 12 mph biker travels. Which system correctly models the situation, and what is $t$?