A passenger car is driving from place A to place B, driving 75 kilometers per hour. It is expected to arrive in 3 hours. How many kilometers should be accelerated?
一辆客车从甲地开往乙地，每小时行驶75千米，预计3小时到达，行了1小时，机器发生故障，就地维修了20分钟，要想准时到达而不误事，以后每小时应加快多少千米？
<gadget id="calculator">75 * 3</gadget>
<output>225</output>

<gadget id="calculator">75 * 1</gadget>
<output>75</output>

<gadget id="calculator">225 - 75</gadget>
<output>150</output>

<gadget id="calculator">20 / 60</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3 - 1 - (1/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">150 / (5/3)</gadget>
<output>90</output>

<gadget id="calculator">90 - 75</gadget>
<output>15</output>

<result>15</result>