s_{1} = v t_{2} = 25 \frac{m}{s} \cdot 160 s = 4000 m = 4 k m

${s_1 = vt_2 = 25\,\mathrm{\frac{m}{s}}\cdot 160\,\mathrm{s} = 4000\,\mathrm{m} = 4\,\mathrm{km}}$

Error