c = \frac{4, 6 \cdot 10^{6} k m}{15 s} \approx 3, 0 \cdot 10^{8} m / s

${c = \frac{4,6 \cdot 10^6\, \mathrm{km}}{\mathrm{15\,s}} \approx 3,0 \cdot 10^8\, \mathrm{m/s}}$

Error