A motorcycle traveled 420km from point A to point B in 5 hours. Part of the road on the way is a cement road, and part is an ordinary road. It is known that the motorcycle travels 110 km per hour on the cement road and 60 km per hour on the ordinary road. How many kilometers does the motorcycle travel on the ordinary road?
一辆摩托车从A地到B地共行驶了420km，用了5小时．途中一部分公路是水泥路，部分是普通公路，已知摩托车在水泥公路上每小时行驶110km，在普通公路上每小时行驶60km，求摩托车在普通公路上行驶了多少千米？
<gadget id="calculator">420 / 110</gadget>
<output>42/11 = around 3.818182</output>

<gadget id="calculator">5 - (42/11)</gadget>
<output>13/11 = around 1.181818</output>

<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">1 / 110</gadget>
<output>1/110 = around 0.009091</output>

<gadget id="calculator">(1/60) - (1/110)</gadget>
<output>1/132 = around 0.007576</output>

<gadget id="calculator">(13/11) / (1/132)</gadget>
<output>156</output>

<result>156</result>