I need 11 to 17

11. Oscar is sprinting away from the Physical Science Building ar the speed of 12.8 kilometen per hour. If the distance between the Physical Science Building to downtown is 2.3km, will he be able to get to downtown in 12 minutes before the Chihuahur's game starts? How long will it take him to reach the Chihuahua's game? 12. If you took 7.4 grams of a rose quartz with an initial mass of 78,5 , what percentage of the compound is left? 13. Maddie's daily routine consists of driving to school, and then going to the gym. The distance from Maddie's house to school is of 17.4km, while the distance from her school to the gym she goes to is of 6.3 kilometers. One day, Maddie decided to skip her lectures and go directly the gym. How many kilometers would Maddie drive from her house to her shool. 14. There is a pebble in a graduated cylinder filled with water and the volume reads 106mL. If you remove the pebble from the graduated cylinder, the volume of the water left over now reads 67mL. The density of the pebble is 2.4g/mL; what is the mass of the pebble? 15. A solid compound has a mass of 46.12g. You scrape 19.20g of material off the compound for testing. What percentage of the compound is left over? 16. Your dad gifted you his old rock collection. If 50.4% of the rocks have a mass of 15g,13% are 12g, and the rest are 16g. What is the averige rock mass? 17. You dropped your wedding ring on a graduated cylinder with an unknown liquid (oh nol), The initial volume was 230mL, after dropping your ring it increased to 230.36mL. Your ring's mass is 7g, what is the density of your wedding ring