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小明要一到高层建筑的11,他走到5层用了100秒,照此速度计算,他还需要走多少秒?
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100÷5×11＝220秒
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小明要到一栋楼的第15层上去，他从第一层走到第五层用了100秒，如果用同样的速度走到15层，还要（　　）秒．
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100÷（5-1）×（15-1），=100÷4×14，=350（秒），350-100=250（秒），答：用同样的速度走到15层，还要250秒；故选：B．
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小明从一楼走到二楼用了15秒,以同样的速度,小明从一楼走到五楼要几秒.
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15/(2-1)=15秒小明从一楼走到五楼15*（5-1）=60秒
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