With more than 300 million USD invested since 2012, drone deliveries will become the fastest-growing application method within the drone market, according to DRONEII's 2019 Drone Delivery report. Drone regulations for the delivery of medical products between hospitals and laboratories specify that medical products sent by drones using a rectangular box may have a combined length (1) and girth (x+x+x+x=4x) of no more than 100 in (see the figure below). Find the dimensions of a rectangular box that has a square cross section and the largest volume that may be used by drones.