一道SAT数学的题A tugboar travels upstream form portA to portB in 8h and downstream form portB to portA in 6,if the distance from A to B is 24miles,and the current in the water is constant,what is the speed of the current
2019-05-23
一道SAT数学的题
A tugboar travels upstream form portA to portB in 8h and downstream form portB to portA in 6,if the distance from A to B is 24miles,and the current in the water is constant,what is the speed of the current
优质解答
设水流速度为x；船速为y
8(y-x) =6(x+y) =24;
所以：x+y =4；
y-x=3
x=0.5（mile/Hr)
y=3.5（miles/Hr)
所以水流速度为 0.4 英里/小时
设水流速度为x；船速为y
8(y-x) =6(x+y) =24;
所以：x+y =4；
y-x=3
x=0.5（mile/Hr)
y=3.5（miles/Hr)
所以水流速度为 0.4 英里/小时