At the gas station, each liter of gas costs $3 but there's a promotion that for every beverage you purchase you save $0.20 on gas. Is your total savings on gas proportional to the number of beverages you purchase? Choose 1

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.