# Wind drift

The plane flies at 860 km/h, passing distance 3000 kilometers with the wind and once again against the wind for 6 h 59 min. What is the wind speed?

Result

v =  31 km/h

#### Solution:

Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):

Be the first to comment!

#### To solve this verbal math problem are needed these knowledge from mathematics:

Looking for help with calculating roots of a quadratic equation?

## Next similar examples:

1. Tourist Jirka
Distance between the points A and B is 13.5 km. Jirka went from point A to point B unknown speed and for an unknown period of time. Back to the point A went slower by 3 km/h which means that went 20 minutes more. How long Jirka took the return journey?
2. Cyclist vs car
Cyclist rode out of the city at 18 km/h. 1 hour 30 minutes behind him started car and caught up with the cyclist in 50 minutes. How fast was driving the car? Where (what kilometer) from the city car overtook a cyclist?
3. Expression with powers
If x-1/x=5, find the value of x4+1/x4
4. Roots
Determine the quadratic equation absolute coefficient q, that the equation has a real double root and the root x calculate: ?
5. Theorem prove
We want to prove the sentence: If the natural number n is divisible by six, then n is divisible by three. From what assumption we started?
6. Equation
Equation ? has one root x1 = 8. Determine the coefficient b and the second root x2.
7. Discriminant
Determine the discriminant of the equation: ?
Find the roots of the quadratic equation: 3x2-4x + (-4) = 0.
9. Storm
So far, a storm has traveled 35 miles in 1/2 hour in direction straight to observer. If it is currently 5:00 p. m. and the storm is 105 miles away from you, at what time will the storm reach you? Explain how you solved the problem.
10. Algebra
X+y=5, find xy (find the product of x and y if x+y = 5)
11. Wavelength
Calculate the wavelength of the tone frequency 11 kHz if the sound travels at speeds of 343 m/s.