设甲追上乙为X秒
5X+(X-1)x100=4X+(X-1)X100+100
5X+100X-100=4X+100X+200
5X=4X+100
X=100不对呀,每次休息10秒找出总共用了100秒,用{(100X5)%100—1}X10+100=140秒, ...
设甲追上乙为X秒
5X+(X-1)x100=4X+(X-1)X100+100
5X+100X-100=4X+100X+200
5X=4X+100
X=100不对呀,每次休息10秒找出总共用了100秒,用{(100X5)%100—1}X10+100=140秒, ...