Question 277004
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 it takes a plane 40 min longer to fly from Boston to LA at 525 mi/h than it does to return at 600 mi/h. how far apart are the cities?
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Let distance between the 2 cities, be D
Then, time the plane takes to fly from Boston to LA is {{{D/525}}}
And, time the plane takes to return from LA to Boston is: {{{D/600}}}
The plane takes 40 minutes, or {{{40/60 = 2/3-hour}}} longer to fly from Boston to LA. 
So, we get the following TIME equation: {{{D/525 - D/600 = 2/3}}}                                                      
                                                                         8D - 7D = 2(1,400) ---- Multiplying by LCD, 4,200

               <font color =red><font size = 3>Distance between the 2 cities</font></font>, or D = <font color =red><font size = 3>2,800 miles</font></font></font></b></font></font></pre>