Emma and ed walk into a room containing 30 assembled tworks and enough pieces to assemble 100 more tworks. a twork takes eight minutes to assemble and 10 minutes to disassemble. if emma starts assembling tworks as ed begins disassembling the ones that were already made, and they both continue to work until there are exactly 35 assembled tworks in the room (and no partially assembled or disassembled tworks), how many minutes will emma have worked?