let the speed of the plane in still air be x mph
let the speed of the wind be y mph
then 570/(x+y) = 3 --->3x + 3y = 570
x + y = 190
570/(x-y) = 5 ---> 5x - 5y = 570
x - y = 114
add them
2x = 304
x = 152
back in the first:
152 + y = 190
y = 38
Flying with the wind, a plane traveled 570 miles in 3 hours. Flying against the wind, the plane traveled the same distance in 5 hours. Find the rate of the plane in calm air and the rate of the wind.
Rate of plane ______mph
Rate of wind ________mph
1 answer
1 answer