Timber log

The ship goes from point x to y. Downstream it takes 4 hours, upstream 6 hours. How long does it take from a point x to y a log?

Correct answer:

x =  24 h

Step-by-step explanation:

$$\begin{gathered} s=4\cdot (v+p) \\ s=6\cdot (v-p) \\ v=10 \\ 4p-s+4v=0 \\ 6p+s-6v=0 \\ v=10 \\ p=2 \\ s=48 \\ x=s\mathrm{/}p=48\mathrm{/}2=24\text{ h} \end{gathered}$$

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