thats 2 komplex, so me NOT gonna duit, but giv yu sum klues... K: take 40 minuts=(2/3) our, so rate=(3/2)... L: take 50% longer=60 minuts=1 our, so rate=1... J: (3/4)*40 min=30minuts, so rate=2... wen gruep werk in parallel (tugether), rate=sum av the rates... em 3...rate=1.5+1+2=4.5, so time=1/4.5=0.222222222 our... time=13 minuts ####### in reel life, alwaes take longer kauz yu hafta get redee B4 werk, & gotta kleen up after.... this time konstant, eech persun gotta du bout same much av it