A train travels 90 km per hour before speeding up, and it takes 15 hours to travel from point A to point B. After speeding up, the speed is 20% faster than before. How many hours does it take to drive from point A to point B after speeding up? (Solve with ratio)
一列火车在提速前每小时行驶90km，从甲地行驶到乙地需要15小时．提速后，速度比原来快20%．提速后从甲地行驶到乙地需要多少小时？(用比例解)
<gadget id="calculator">90 * 15</gadget>
<output>1_350</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">90 * (1/5)</gadget>
<output>18</output>

<gadget id="calculator">90 + 18</gadget>
<output>108</output>

<gadget id="calculator">1_350 / 108</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>