Assignment Booklet 4 Unit 4: Rational Expressions and Equations 10. Consider each scenario: a. A high-speed passenger train in Europe completes an 800 km trip in 3 hours. The train travels the first 600 km at an average speed that was 100 km/h faster than the last 200 km of the trip. If > represents the average speed of the train on the second part of the trip, then an equation to represent this situation is: 600 200 = 3 x +100 Identify all restrictions on the variable x in this context. (2 marks) b. Kailey is making earrings to sell at a local market. She spends $80 on supplies and decides to keep 4 pairs of earrings to give to her friends. Kailey sells the rest of the earrings she made for $175, making a profit of $9 per pair of earrings. If'n represents the number of pairs of earrings Kailey made, then an equation that represents this information is: 9 =- 175 80 1 -4 n Identify all restrictions on the variable n in this context. (2 marks)