Will I use the distance formula for this problem.
A airplane traveling at 390 km/hr in still air encounters a 65 km/hr headwind. How long will it take the plane to travel 725 km into the wind?
390=r*65
time = distance/speed, so
725/(390-65)
To solve this problem, you can use the formula for time, which is distance divided by rate.
First, let's calculate the effective speed of the airplane when flying into the headwind. The headwind is opposing the motion of the plane, so we subtract the speed of the headwind from the still air speed of the airplane:
Effective speed of the airplane = 390 km/hr - 65 km/hr = 325 km/hr
Now, we can use the formula for time to find the answer:
Time = Distance / Speed
Time = 725 km / 325 km/hr
To evaluate this expression, let's divide 725 by 325:
Time = 725 km / 325 km/hr = 2.23 hours
So, it will take approximately 2.23 hours for the plane to travel 725 km into the wind.