Using Fig. 17.13, determine the minimum boom length that will permit the crane to lift a load 24 ft high to a position 84 ft above the surface on which the crane is operating. The length of the block, hook, and slings that are required to attach the hoist rope to the load is 6 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 80 ft. 180 -75 70 65 +60 55 -50 45 190 180 boom 180 170' boom 170 160' boom 160 150' boom 150 140 boom 140 130 boom 130 120 boom 120 110' boom 110 100 boom 100 90' boom 90 80' boom 80 70' boom 70 40 359 30 Height above ground, ft 251 20 60 15* 50 40 1 30 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 Distance from center of rotation, ft FIGURE 17.13 Working ranges for a 200-ton crawler crane, nominal rating Source: Manitowoc Engineering Co. Select one: O a. 120 ft o b. 140 ft O c. 110 ft O d. 130 ft