SOLUTION: An airplane flew for 3 hr with a 45 mph tailwind. The return flight against the same wind took 4 hr. Find the speed of the plane in still air.

Algebra ->  Test -> SOLUTION: An airplane flew for 3 hr with a 45 mph tailwind. The return flight against the same wind took 4 hr. Find the speed of the plane in still air.      Log On


   

Question 314384: An airplane flew for 3 hr with a 45 mph tailwind. The return flight against the same wind took 4 hr. Find the speed of the plane in still air.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Rate*Time=Distance
%28V%2B45%293=D
%28V-45%294=D
Since they both equal D set them equal to each other and solve.
3%28V%2B45%29=4%28V-45%29
3V%2B135=4V-180
-V=-315
highlight%28V=315%29
The plane speed in still air is 315 mph.