a) Med båt: $F_{L1} = \frac{6000}{2} = 3000$ , $P_{1} = F_{L1}$ , $U_{1} = 0.5$ , $L_{10m1} = \left(\frac{C}{P_{1}}\right)^{\frac{10}{3}} = 2352$ milj varv
Utan båt: $F_{L2} = \frac{1560}{2} = 780$ , $P_{2} = F_{L2}$ , $U_{2} = 0.5$ , $L_{10m2} = \left(\frac{C}{P_{2}}\right)^{\frac{10}{3}} = 209662$ milj varv

\begin{array}{l} L _ {1 0 m} = \frac {1}{\frac {U _ {1}}{L _ {1 0 m 1}} + \frac {U _ {2}}{L _ {1 0 m 2}}} = 4 6 5 2 \mathrm {milj} \mathrm {varv} \\ s _ {9 0 \%} = \pi D _ {H} \cdot L _ {1 0 m} \cdot 1 0 ^ {6} = 5 2 6 1 \cdot 1 0 ^ {6} \mathrm {m} \rightarrow 5 2 6 1 0 0 \mathrm {m i l} \\ \end{array}