a motoboat travelling at full speed against the current goes 14miles an hour.travelling at a half sp

题目

a motoboat travelling at full speed against the current goes 14miles an hour.travelling at a half speed with the current goes 10miles an hour .find the rate of the current and the maximum speed of the boat

答案

一艘摩托艇,若逆流全速行驶,速度为14英里/小时.若顺流半速行驶,速度为10英里/小时.求水流速度和摩托艇的最高速度.
设水流速度是x,摩托艇的最高速度是y
y-x=14
x+(y/2)=10
解得,x=2,y=16
水流速度是2英里/小时,摩托艇的最高速度是16英里/小时.