Find each runner&rsquo;s speed, then use the relative speed to find the time to lead by 100 m.<br><br>
&bull; Alice&rsquo;s speed = 300 ÷ 60 = 5 m/s<br>
&bull; Bella&rsquo;s speed = 360 ÷ 60 = 6 m/s<br>
&bull; Bella gains 6 − 5 = 1 m on Alice each second<br>
&bull; To lead by 100 m: time = 100 ÷ 1 = 100 seconds<br>
&bull; 100 s = \frac{100}{60} = 1\frac{2}{3} minutes<br>
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Final Answer: 1\frac{2}{3} min