A car transports materials to the disaster area at a speed of 75 kilometers per hour, and travels for 4 hours to reach the destination. It took 3 hours to return, what is the return speed in kilometers?
一辆汽车以每小时75千米的速度往灾区运送物资，行驶4小时到达目的地．返回时用了3小时，返回的速度是多少千米？
<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">75 * (4/3)</gadget>
<output>100</output>

<result>100</result>