man rides his bicycle down a slope. Ride uphill at a speed of 4 meters per second for 60 seconds, and ride downhill at a speed of 6.5 meters per second for 40 seconds. What is the average speed of the bicycle on this slope?
某人骑自行经过了一段坡路．上坡以每秒4米的速度骑了60秒，下坡以每秒6.5米的速度骑了40秒．自行车在这坡路上行驶的平均速度是多少？
<gadget id="calculator">4 * 60</gadget>
<output>240</output>

<gadget id="calculator">6.5 * 40</gadget>
<output>260</output>

<gadget id="calculator">240 + 260</gadget>
<output>500</output>

<gadget id="calculator">60 + 40</gadget>
<output>100</output>

<gadget id="calculator">500 / 100</gadget>
<output>5</output>

<result>5</result>