If a plane can travel 490 miles per hour with the wind and 450 miles per hour against the wind, find the speed of the plane without a wind and the speed of the wind.

The accurate answer will be 470mi/hour

S=plane's speed

w=windspeed

travels490 mh with wind

450 agains wind

s+w=490mph

s-w=450

add them toegether

s+w=490

s-w=450 +

2s+0w=940

2s=940

divide by 2

s=470

find wind speed

s+w=490

470+w=490

w=20

windspeed=20mph

planespeed=470mph