Posted by **Meghan** on Wednesday, March 24, 2010 at 8:59am.

A plane can fly 140 mph in calm air. Flying with the wind, the plane can fly 700 mi in the same amount of time it takes to fly 420 mi against the wind. Whats the rate of the wind?

- Math -
**drwls**, Wednesday, March 24, 2010 at 9:15am
Let V be the wind speed. The flight time is D/(140+V)with a tail wind and

D/(140-V) with a head wind.

Solve 700/(140+V) = 400/(140-V)

98,000 -700V = 56,000 +400V

1100V = 42,000

V = 38.2 km/h

- Math -
**Meghan**, Wednesday, March 24, 2010 at 9:37am
Thanks

## Answer this Question

## Related Questions

- College Math - Im having a hard time trying to figure out how to do this problem...
- Algebra 2 - Flying with the wind, a small plane flew 332 mi in 2 h. Flying ...
- math - It took a small plan 1 hour longer to fly 480 miles against the wind than...
- Algebra 1B - it took a small plane 3 hours more to fly 475 miles against the ...
- Algebra - Flying with the wind, a small plane flew 360 miles in 2hours. Against ...
- Algebra - Flying with the wind, a small plane flew 360 miles in 2hours. Against ...
- Math - An airplane flying at a speed of about 100 mph was once overtaken and ...
- math - A pilot can fly an MD-11 2160 miles with the wind in the same time she ...
- Math - A spy plane, whose average speed in still air is 250 mph, departs with a...
- Algebra, math, - A helicopter can fly 120 mph in still air. When flying to a ...

More Related Questions