A closed, rectangularfaced box with a square base is to be constructed using only 55 m2 of material. What should the height h and base length I) of the box be so as to maximize its volume? Please give exact answers, or if not answers accurate to 3 decimal places. h = Number m b = Number m The fuel efficiency E (in kilometres per litre). of a car driven at a speed v (in kilometres per hour) is approximated by 1, 900v E(v) = 02 + 6, 400 If the speed limit is 100 km/h, determine the legal speed that will maximize fuel efficiency. V =