Two robots, Kiki and Pippi, stand at different positions on the straight line. If they move towards each other at the same time, they will meet after 5 minutes; if they move in the same direction at the same time, Kiki will catch up with Pippi after 15 minutes. Then Qiqi's speed is how many times of Pippi's speed.
两个机器人奇奇和皮皮站在直线跑到上的不同位置，如果它们同时相向运动，则5分钟后相遇；如果它们同时同向运动，则15分钟后奇奇从后面追上皮皮．那么奇奇的速度是皮皮的速度的多少倍．
<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(2/15) / (1/15)</gadget>
<output>2</output>

<result>2</result>