Find the time needed at 80 km/h. Compare with 20 min. If too slow, find required speed.<br><br>
&bull; Time at 80 km/h = 30 ÷ 80 = 0.375 h = 22.5 min<br>
&bull; 22.5 min &gt; 20 min, so she will NOT reach in time<br>
&bull; Required speed = 30 ÷ (\( \frac{20}{60} \)) = 30 × 3 = 90 km/h<br><br>
Final Answer: 90 km/h