The speed of the helicopter in calm air is [[$ 150 $]] km / h. The helicopter is scheduled to fly [[$ 60 $]] km north. How long does the trip take when the north wind is [[$ 10 $]] m / s?

The helicopter moves in the wind at a speed of



[[$ v ≈ $]] km/h

In the north wind, the flight takes



[[$ t ≈ $]] minutes