The distance between A and B is 6300 meters. A starts from A to B. After 20 minutes, B and C also start from A to B. After another 30 minutes, B catches up with A. B returns immediately after arriving at B, and A, B, and C meet at the same time on the way. It is known that the speed of C is faster than that of A (1/3), so how many meters does A travel per minute?
A、B两地相距6300米，甲从A地出发到B地，20分钟后乙、丙也从A地出发到B地，又过了30分钟乙追上甲．乙到达B地后立即返回，途中甲、乙、丙三人同时相遇．已知丙的速度比甲的速度快(1/3)，那么甲每分钟行多少米．
<result>70</result>