A total of 98 trees are planted on both sides of a street including both ends, and the distance between two adjacent trees is 30 meters, what is the length of the street in meters?
一条大街的两侧连两端在内共植树98棵，每相邻两棵树相距30米，则这条大街长多少米．
<gadget id="calculator">98 / 2</gadget>
<output>49</output>

<gadget id="calculator">49 - 1</gadget>
<output>48</output>

<gadget id="calculator">48 * 30</gadget>
<output>1_440</output>

<result>1_440</result>