Problem Solving Using Algebraic Models
"The Chunnel connects the United Kingdom and France by a railway tunnel under the English Channel. The British started tunneling 2.5 months before the French and averaged 0.63 kilometers per month. The French averaged 0.47 kilometers per month. When the two sides met, they had tunneled 37.9 kilometers. How many kilometers did each country build? If the French started tunneling on February 28, 1988, approximately when did the two sides meet?"
And there's this one, if you feel like being extra helpful, too.
"Some of your classmates ask you to type their history papers throughout a 7 week summer course. How much should you charge per page, if you want to earn enough to pay for the flying lessons in Exercise 20 (The lessons are 80 dollars each and the introductory course is 5/8 of the normal lesson price. ) and have 75 dollars left over for spending money? You estimate you can type 40 pages per week. Assume that you have to take 9 flying lessons plus the introductory lesson and that you already have $375 to spend on lessons."