Homework Help: 8th Grade Algebra

Posted by Gabrielle on Saturday, March 7, 2009 at 7:32pm.

I don't know how to do these types of problems whatsoever.

1) It takes a small jet plane 4 hours less time than it takes a propeller-driven plane to travel from Glen Rock to Oakville. The jet plane averages 637 km/h while the propeller plane averages 273 km/h. How far is it from Glen Rock to Oakville?

2)An airplane took 2 hours to fly 600 km against a head wind. The return trip with the wind took 1 2/3 hours. Find the speed of the plane in still air.

8th Grade Algebra - bobpursley, Saturday, March 7, 2009 at 7:57pm
Let d be distance.

d=637*Time
d=273*(Time+4)
set them equal to each other, and solve for time. Then solve for d.

2)
600=(Speed-headwind)*2
600=(Speed+headwind)1.66

divide the first equation by 2, and the second by 1.66

add the equations...
300+600/1.66 = 2*Speed
solve for speed
8th Grade Algebra - Kristen, Tuesday, June 30, 2009 at 3:41pm
kjc

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