Aproject consists of replacing the track on an existing railroad line, involving 3,000 feet of track. the old track can be removed at a rate of 70 feet per hour. the old railroad ties can be removed at a rate of 200 feet (measured along the track) per hour. the new ties can be installed at a rate of 25 feet per hour, and the replacement track can be installed at a rate of 40 feet per hour. show this operation on a linear schedule. assume that the minimum float for an activity at any location is 1 day.