Time = Distance &divide; Speed.<br><br>&bull; Time = 300 km &divide; 45 km/h = \( \frac{300}{45} = \frac{20}{3} \) h<br>&bull; \( \frac{20}{3} = 6.666... \)<br>&bull; Rounded to 1 decimal place: 6.7 h<br><br>Final Answer: 6.7 h