19.小明和小军分别从甲、乙两地同时出发, 相向而行。若两人按原定速度前进, 则4时相遇; 若两人各自 都比原定速度多1千米 / 时，则3时相遇。甲、乙两地相距多少千米?

Step 1 ：1. Set up two equations based on the given information: \(D = 4(V_1 + V_2)\) and \(D = 3(V_1 + 1 + V_2 + 1)\)

Step 2 ：2. Solve the equations to find the value of D: \(D = 24\)

Step 3 ：3. \(\boxed{24}\) The distance between the two places is 24 kilometers.