Thursday

November 27, 2014

November 27, 2014

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

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 7:22pmLet 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 7:40pmThe equation should read:

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

**Answer this Question**

**Related Questions**

10th grade Academic Math - hi can you help me with this problem please, thank ...

10th grade Academic Math - hi can you help me with this problem please, thank ...

11th grade - A 625-kg racing car completes one lap in 14.3 s around a circular ...

physics - The combined mass of a race car and its driver is 600. kilograms. ...

Algebra - Pls help me with these problem solving sums...

physics - If a car completes a 3.8 mi oval track in 69.7 s, what is the average ...

physics - If a race car completes a 3 mi oval track in 50 s, what is its average...

phyisics - A 615 kg racing car completes one lap in 14.3 s around a circular ...

physics - A 625-kg racing car completes one lap in 14.3 s around a circular ...

Physics - Another problem I need help with. An auto race is held on a circular ...