A train travels 200 kilometers from city A to city B in 2 hours, and travels another 150 kilometers to city B at the same speed. How many hours will it take to complete the journey? (Answer with proportional knowledge)
一列火车从甲城开往乙城，2小时行了200千米，用同样的速度又行驶了150千米到达乙城，行完全程还需用几小时？(用比例知识解答)
<gadget id="calculator">200 / 2</gadget>
<output>100</output>

<gadget id="calculator">150 / 100</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>