13. Suppose a car travels at a constant rate of 70 kph for 2 hours and travels 55 kph thereafter. Show that distance travelled is a function of time and nd the rule of the function. 14. A man jogs for 20 minutes at a rate of 6 kph, then walks for 30 minutes at a rate of 3 kph, then sits and rests for 15 minutes and nally walks for 45 minutes. Find the rule of the function that expresses his distance travelled as a function of time. 15. A remittance company charges its customers based on the delivery rate table as shown. Amount is in Philippine peso. Destination 1 kg 3 kg 5 kg 10 kg 20 kg (max) (max) (max) (max) (max) NCR 120 160 220 420 m 150 190 320 620 1,220 150 190 370 720 1,420 (a) Write a rule of a piecewise-defined function C such that C(x) is the charge due on a weight 2: kg for NCR. (b) Graph the function in (a) (c) Use the table to nd C (12.3) in Mindanao (d) Use the table to nd C [2.2) in Luzon