There is a row of telephone poles beside the road, and the distance between every two adjacent poles is 15.5 meters. One day, Beibei and Dad went for a walk after dinner. How many meters did they walk from the first to the tenth.
路旁有一排电线杆，每相邻两根间的距离都是15.5米．有一天，贝贝和爸爸饭后去散步，他们从第一根走到第十根，走了多少米．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">15.5 * 9</gadget>
<output>139.5</output>

<result>139.5</result>