IF A PLANE CAN TRAVEL 480 MILES PER HOUR WITH THE WIND AND 380 MILES PER HOUR AGAINST THE WIND , FIND THE SPEED OF THE PLANE IN STILL AIR

Hi Mishonta;

x=speed of plane in still air

y=wind speed

x+y=480

x-y=380

Let's add the two equations together to eliminate y...

x+y=480

x-y=380

x-y=380

2x=860

x=430

**still air speed is 430 miles/hour**

## Comments