You run a delivery company, delivering in three different areas of manhattan, a, b and c. in average, a trip to the area a takes 4 hours, 5 gallons of fuel and you deliver 3 tons of goods. a trip to area b takes 6 hours, 4 gallons of fuel and you deliver 1 ton of goods. finally, a trip to area c takes 3 hours, 2 gallons of fuel and you deliver 3 tons of goods. every day