Xiaohua rides a bicycle, and Xiaoming rides a motorcycle and travels towards each other from two places 80 kilometers apart at the same time. After 5 hours of departure, they were 205 kilometers apart. It is known that Xiao Hua travels 15 kilometers per hour, how many kilometers per hour does Xiao Ming travel? (Solution of column equation)
小华骑自行车，小明骑摩托车同时从相距80千米的两地相向而行，途中相遇后有继续前进成背向而行．在出发5小时后，他们相距205千米．已知小华每小时行15千米，则小明每小时行多少千米？(列方程解)
<gadget id="calculator">15 * 5</gadget>
<output>75</output>

<gadget id="calculator">80 - 75</gadget>
<output>5</output>

<gadget id="calculator">205 + 5</gadget>
<output>210</output>

<gadget id="calculator">210 / 5</gadget>
<output>42</output>

<result>42</result>