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September 17, 2014

September 17, 2014

Posted by **Shreya** on Sunday, January 8, 2012 at 11:19pm.

if average speed of plane from red deer to winnipeg is xkm/hr, state an expression for the average speed of the plane from winnipeg to red deer in km/hr.

i wrote (x-20)km/hr

calculate average speed of the plane from winnipeg to red deer.

i also not real get how to do this. i go speed = distance/time?

calculate total flying time for round trip.

- math-calculus -
**Damon**, Monday, January 9, 2012 at 5:35amTime to W = 1260/x

Time back if had gone all the way = (1260/1200)* time to W = 1260^2/1200x

speed back =(x-20)

so

1260 = (x-20)(1260^2/1200x)

1200 x = (x-20)(1260)

1200 x = 1260 x - 20(1260)

60 x = 20(1260)

x = 420

x-20 = 400

- math-calculus -
**Shreya**, Monday, January 9, 2012 at 10:08amthanks very much damon :)

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