Homework Help: 10th grade Academic Math

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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