Question 189781
Distance(d) equals Rate(r) times Time(t) or d=rt; r=d/t and t=d/r

Let r=rate of east bound plane
Then r+25=rate of west bound plane
Distance east bound plane travels=r*1
Distance west bound plane travels=(r+25)*1
The above two distances must add up to 575 mi, so:

r*1+(r+25)*1=575 or
r+r+25=575  subtract 25 from both sides
r+r+25-25=575-25  collect like terms
2r=550  divide each side by 2
r=275 mph---------------------------rate of east bound plane
r+25=275+25=300 mph-------------------rate of west bound plane

CK
275*1+300*1=575
575=575


Hope this helps---ptaylor