A30- by 42-in. jaw crusher is set to operate with a 2½-in. opening. the output from the crusher is discharged onto a screen with 1½-in. openings. the efficiency of the screen is 90%. the aggregate that does not pass through the screen goes to a 40- by 20-in. roll crusher, set at 1¼ in. determine the maximum output of the roll crusher in tons per hour for material less than 1 in. there will be no recycle of roll crusher oversize. what amount, in tons per hour, of the roll crusher output is in the range of 1 in. to ½ in., and what amount is less than ½ in.?