The whole journey from A to B is 1.5 kilometers. A takes 9.7 minutes to run the distance, and B takes 2 minutes longer to complete the distance. How many minutes does it take B to run 1 kilometer on average?
从A地到B地全程有1.5千米，甲用了9.7分钟跑完全程，乙比他多用2分钟跑完全程，乙平均跑1千米需多少分钟．
<gadget id="calculator">9.7 + 2</gadget>
<output>11.7</output>

<gadget id="calculator">11.7 / 1.5</gadget>
<output>7.8</output>

<result>7.8</result>