A river flows at 2km/h,and john takes 6h to row 16km to up the ri_其他解答

A river flows at 2km/h,and john takes 6h to row 16km to up the river and 16 km back.How fast did he row?
PS:answer:3.74km/h

人气：388 ℃　时间：2020-06-19 04:17:00

解答

16/(x+2)+16/(x-2)=6