问题描述：
pass first在游泳里是什么意思
是在这道题里的：2 swimmers at opposite ends of a pool decide to race each other over 2 lenghths.They started at the same time,and when they pass first they are 20m from the end at which A started.When they next pass,they are 5m from B's starting end.
1) Who won the race
2)How long was the pool
crystalorange:你先给我，
是在这道题里的：2 swimmers at opposite ends of a pool decide to race each other over 2 lenghths.They started at the same time,and when they pass first they are 20m from the end at which A started.When they next pass,they are 5m from B's starting end.
1) Who won the race
2)How long was the pool
crystalorange:你先给我，
问题解答：
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