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:

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

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