A train travels from City A to City B at a speed of 120 m/h, arrives in 4 hours, and arrives 1 hour earlier when it returns. What is the speed of the train when it returns?
一列火车从甲城开往乙城，行驶速度为120米/时，4小时到达，返回时提前了1小时到达返回时这列火车的速度是多少？
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">120 * (4/3)</gadget>
<output>160</output>

<result>160</result>