Mr. Zhang drove from place A to place B at a speed of 45 kilometers per hour. It took 4 hours, and it took 3 hours to return. What was the speed when he returned?
张老师驾车从甲地到乙地的速度是每小时45千米，用了4小时，返回时用了3小时，返回时速度是多少？
<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">45 * (4/3)</gadget>
<output>60</output>

<result>60</result>