The speed of car A is (4/5) the speed of car B. Cars A and B drive towards each other from two places at the same time, and meet at a distance of 40 from the midpoint. Find the whole journey of the two places.
甲车的速度是乙车速度的(4/5)，甲乙两车从两地同时开出相向而行，在距中点40处相遇，求两地全程．
<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(5/9) - (4/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">80 / (1/9)</gadget>
<output>720</output>

<result>720</result>