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 result:

x =  24 h

Solution:

 s=4 (v+p) s=6 (vp) v=10  4ps+4v=0 6p+s6v=0 v=10  p=2 s=48 x=v=10x=s/p=48/2=24 h \ \\ 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=v=10x=s/p=48/2=24 \ \text{h}



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