Wind drift

The plane flies at 900 km/h, passing distance 1800 kilometers with the wind and once again against the wind for 4 h 1 min. What is the wind speed?

Correct answer:

v =  46 km/h

Step-by-step explanation:

$$\begin{gathered} t_1+t_2=4+{\displaystyle \frac{1}{60}} \\ (900+v)t_1=1800 \\ (900-v)t_2=1800 \\ v=46\text{ km/h } \end{gathered}$$

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