Railroad

The railroad runs parallel to the railway. The train travels at 36 km/h on track. In the opposite direction, the motorcycle rides at 90 km/h. The train passes in 3 seconds. How long is a train?

Correct result:

x =  105 m

Solution:

$$\begin{gathered} v_1=36\mathrm{/}3.6=10\text{ m/s } \\ {v}_2=90\mathrm{/}3.6=25\text{ m/s } \\ t=3\text{ s } \\ x=(v_1+v_2)\cdot t=(10+25)\cdot 3=105\text{ m} \end{gathered}$$

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