Question

【題目】一列隊(duì)伍行進(jìn)速度是2.5m/s,經(jīng)過(guò)一座全長(zhǎng)100m 的橋，從隊(duì)伍第一人踏上橋到最后一人離開橋共需1min，則這列隊(duì)伍長(zhǎng)

A. 50m

B. 100m

C. 150m

D. 250m

Answer 1

【答案】A

【解析】

一列隊(duì)伍行進(jìn)速度是2.5m/s, 從隊(duì)伍第一人踏上橋到最后一人離開橋共需1min，隊(duì)伍通過(guò)的路程是

S=vt=2.5m/s*60m=150m

這列隊(duì)伍長(zhǎng)是

150m-100m=50m

思路先根據(jù)公式S=vt計(jì)算出隊(duì)伍通過(guò)的路程是150m，再減去橋的長(zhǎng)度100m即可求出隊(duì)伍的長(zhǎng)度是50m。