we are given
the boat speed is 32 kilometers per hour
so, speed is
[tex]v=32km/hr[/tex]
the seine has a length of 764 kilometers but only 547 kilometers
so, the distance is
[tex]d=547km[/tex]
now, we can find time
[tex]t=\frac{d}{v}[/tex]
now, we can plug values
and we get
[tex]t=\frac{547}{32} hr [/tex].................Answer