A car travels from A to B, and a bus travels from B to A. A car travels 75 kilometers per hour and arrives in 5 hours. When it encounters a bus, it travels for exactly 3 hours. How many kilometers does the bus travel per hour?
一辆小汽车从甲地开往乙地，同时一辆大客车从乙地开往甲地．小汽车每小时行驶75千米，行驶5小时到达，在遇上大客车时正好行驶了3小时，这辆大客车每小时行驶多少千米．
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">75 * (2/3)</gadget>
<output>50</output>

<result>50</result>