After a certain train speed is increased, it travels an average of 150 kilometers per hour, which is (5/4) before the speed increase. How many kilometers per hour is the average speed of the train before this speed increase?
某次列车提速后，平均每小时行150千米，是提速前的(5/4)，这次列车提速前平均每小时行多少千米？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">150 / (5/4)</gadget>
<output>120</output>

<result>120</result>