甲的效率=1/20乙的=1/30设休息了x天11.5*1/20+(14-x)*1/30=1x=1.25
1/20+1/30=1/122.5*1/20=1/814-12=2(天)2*(1/12)=1/61/6-1/8=1/24(1/24)/(1/30)=5/4(天)
