A boat can travel 104 km downstream in 8 hours. If the speed of the stream is 2 km/h, then find in what time will it be able to cover 13 km upstream? 

1
\(\rm 2\frac{2}{3} \ hours\)
2
\(\rm 1\frac{4}{9} \ hours\)
3
\(\rm 2\frac{1}{2} \ hours\)
4
\(\rm 1\frac{2}{3} \ hours\)

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