一艘巡洋舰用70千米/小时的速度追赶在它前面10千米的一艘战斗舰，巡洋舰追了210千米，恰好赶上战斗舰，求战斗舰的速度．
根据v=
| s |
| t |
t战=t巡=
| s巡 |
| v巡 |
| 210km |
| 70km/h |
战斗舰行驶的距离：
s战=s巡-△s=210km-10km=200km，
战斗舰的速度：
v战=
| s战 |
| t战 |
| 200km |
| 3h |
答：战斗舰的速度约为66.7km/h．
| 根据句意，用所给单词的适当形式填空。 | |
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