(1)甲、乙两人练习百米赛跑,甲的速度是6.5m/s,乙的速度是7m/s,若乙让甲先跑1s,则乙追上甲需( )A.14s B.7s C.13s D.6.5s
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(1)甲、乙两人练习百米赛跑,甲的速度是6.5m/s,乙的速度是7m/s,若乙让甲先跑1s,则乙追上甲需()A.14sB.7sC.13sD.6.5s(1)甲、乙两人练习百米赛跑,甲的速度是6.5m/s
(1)甲、乙两人练习百米赛跑,甲的速度是6.5m/s,乙的速度是7m/s,若乙让甲先跑1s,则乙追上甲需( )A.14s B.7s C.13s D.6.5s
(1)甲、乙两人练习百米赛跑,甲的速度是6.5m/s,乙的速度是7m/s,若乙让甲先跑1s,则乙追上甲需( )
A.14s B.7s C.13s D.6.5s
(1)甲、乙两人练习百米赛跑,甲的速度是6.5m/s,乙的速度是7m/s,若乙让甲先跑1s,则乙追上甲需( )A.14s B.7s C.13s D.6.5s
(1+t)6.5=7t 6.5t+6.5=7t 0.5t=6.5 t=13s 乙追上甲需13s.