Cars A and B drive from the east and west at the same time and meet at a distance of 5 kilometers from the midpoint. It is known that A's speed is B's (4/5), so how many kilometers are the distance between the east and west places?
甲、乙两车从东西两地同时相对开出，在距中点5千米处相遇，已知甲的速度是乙的(4/5)，那么东西两地相距多少千米．
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">2 / 1</gadget>
<output>2</output>

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

<gadget id="calculator">5 * 2 * 9</gadget>
<output>90</output>

<result>90</result>