Question

At maximum speed, an airplane travels 1680 miles against the wind in 5 hours. Flying with the wind, the plane can travel the same distance in 4 hours. What is the speed of the plane with no wind?

Answer 1

(miles / hour) * (hours) = miles

miles/hours = miles per hour

Answer 2

Call speed of plane x, speed of wind y

distance=speed*time

first equation for against the wind

1680=(x-y)5

second for with the wind

1680=(x+y)4

now solve as a system of equations to find x

Answer 3

Thank you!!!!