There is a 25-kilometer-long road around the lake at the Dongbai Lake Reservoir in Zhuji City, where the City Cycling Tournament Invitational Tournament is being held. Player Wang Dong is now driving at a constant speed of 12.5 kilometers per hour. 0.8 hours after Wang Dong started, the coach found that Wang Dong forgot to hang up the runner's bib, so he immediately put on the bib and started from the starting point on a motorcycle. The speed is 37.5 km/h. How long does it take for the coach to deliver the number bib to Wang Dong at the earliest?
诸暨市东白湖水库有一条长25千米的环湖公路，市环湖自行车赛邀请赛正在这里举行．选手王东现在正以每小时12.5千米的速度匀速行驶，王东出发0.8小时后，教练发现王东忘挂了选手号码布，就立即带上号码布骑摩托车从起点出发，摩托车行驶的速度是37.5千米/时．问教练最快需多长时间能把号码布送到王东这里？
<gadget id="calculator">12.5 * 0.8</gadget>
<output>10</output>

<gadget id="calculator">37.5 - 12.5</gadget>
<output>25</output>

<gadget id="calculator">10 / 25</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>