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

## 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 ...
- physical science - A car travels in a northward direction for a total distance ...
- Math - I have trouble solving distance rate problems. I have a worksheet that I ...
- Algebra! Help needed! - I'm having a little trouble with this problem... Please ...
- MATH - A motorbike traveling a speed of 60 miles per hour, completes 4/7 of its ...
- Algebra - The time it takes to cover the distance between two cities by car ...
- Algebra - The time it takes to cover the distance between two cities by car ...
- Algebra - I'm having a little trouble with this problem... Please try and walk ...
- MATH! - a round trip car ride took 12 hours. the first half of the trip took 7 ...

More Related Questions