If you take a train with a speed of 60 kilometers per hour, you can travel from city A to city B in 21 hours. If you take a high-speed train with a speed of 240 kilometers per hour, how many hours can you get there?
乘时速60千米的火车，21小时可以从甲城到达乙城，如果乘时速240千米的高速列车，几小时可能到达？
<gadget id="calculator">21 / 240</gadget>
<output>7/80 = around 0.0875</output>

<gadget id="calculator">60 * (7/80)</gadget>
<output>21/4 = around 5.25</output>

<result>21/4 = around 5.25</result>