Hi i need help with these questions

11. Clive is training to run in a marathon. Each day he runs and walks a total of 24 km. If he runs 5 km more than twice as far as he walks, how many kilometres does he run? 12. A car with a standard transmission costs $15 000 to purchase and 25/km to drive. A car with an automatic transmission costs $17 000 to purchase, but only 20c/km to drive. When is the cost to operate both vehicles the same? 13. At Merel's Restaurant, the server earns $100/d and the cook earns $150/d. However, of all the tips collected, the server receives 75% of the total and the cook receives 25%. What amount of tips must be collected so that the cook and the server earn the same daily pay