The distance between A and B is 150 kilometers. An express train and a slow train leave from A and B respectively at the same time. After 1.5 hours, the two cars continue to drive for 0.5 hours, and the slow train just arrives at the middle of the two places. At this point, how many kilometers is the express train from the starting point of the slow train?
甲、乙两地相距150千米，一辆快车与一辆慢车分别从甲、乙两地相对同时开出，经过1.5小时相遇，相遇后两车继续行驶0.5小时，慢车正好到达两地的中点，这时快车离慢车的出发地还有多少千米？
<gadget id="calculator">150 / 1.5</gadget>
<output>100</output>

<gadget id="calculator">1.5 + 0.5</gadget>
<output>2</output>

<gadget id="calculator">150 / 2 / 2</gadget>
<output>75/2 = around 37.5</output>

<gadget id="calculator">100 - (75/2)</gadget>
<output>125/2 = around 62.5</output>

<gadget id="calculator">(125/2) * 2</gadget>
<output>125</output>

<gadget id="calculator">150 - 125</gadget>
<output>25</output>

<result>25</result>