Posted by **Neil** on Monday, June 7, 2010 at 7:19pm.

hi can you help me with this problem please, thank you.-----------------

If the speed of an experimental car is decreased by 8km/h it completes a 140 km trip in 2 hours more than had it been traveling at its usual speed. Determine its usual speed.

- 10th grade Academic Math -
**MathMate**, Monday, June 7, 2010 at 7:22pm
Let S=usual speed,

Then S-8=experimental speed.

Taking the difference between the "experimental time" and "usual time", we get:

140/S - 140/(S-8) = 2

Solve for S.

- Algebra : correction -
**MathMate**, Monday, June 7, 2010 at 7:40pm
The equation should read:

140/(S-8) - 140/S = 2

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