修一条路,甲队先修x天,每天修100米;乙队修15天,修了y米,两队每天修路多少米?

问题描述:

修一条路,甲队先修x天,每天修100米;乙队修15天,修了y米,两队每天修路多少米?

(100x+y)/(x+15)