英语翻译

问题描述：

英语翻译
A boat moves through the water of a river at
9.77 m/s relative to the water,regardless of
the boat’s direction.
If the current is flowing at 7.97 m/s,how
long does it take the boat to complete a trip
consisting of a 235 m displacement down-
stream followed by a 355 m displacement up-
stream?
Answer in units of s.如题