Patty went to her cousins for the weekend. She drove 260 km in 2 h 45 min, some of it on a 100 km/h highway and the rest on 80 km/h roads. This has to be written as a linear equation

Answer 1

If she drove x km at 100 km/hr, then the rest (260-x) was at 80 km/hr

since time = distance/speed, just add up the times for each part:

x/100 + (260-x)/80 = 11/4

(2 hr 45 min = 2 3/4 hours)