Using fig. 17.13, select the minimum-length boom required to hoist a load of 80,000 lb from a truck at ground level and place it on a platform 76 ft above the ground. the minimum allowable vertical distance from the bottom of the load to the boom point of the crane is 42 ft. the maximum horizontal distance from the center of rotation of the crane to the hoist line of the crane when lifting the load is 40 ft.