Timber log

The ship goes from point x to y. Downstream it takes 4 hours, and 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)  4 (v+p)  = 6(vp) 4v+4p = 6v6p 10p = 2v v = 5p  x = s/p x = 6 (vp)/p x = 6 (5pp)/p  x=6 (51)=24 h

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