Lianshui to Nanjing is 240 kilometers away. Two passenger and freight cars depart from the two places at the same time and drive opposite each other. The two cars meet in Xuyi within 1.5 hours, and the speed of the passenger car is 90 kilometers per hour. What is the approximate speed of the truck in km/h?
涟水到南京240千米，客货两车分别从两地同时发车，相对而行，两车1.5小时在盱眙相遇，客车速度90千米/时．货车速度大约是多少千米/时？
<gadget id="calculator">240 / 1.5</gadget>
<output>160</output>

<gadget id="calculator">160 - 90</gadget>
<output>70</output>

<result>70</result>