Answer:
[tex]\boxed {\tt 3.6 \ seconds}[/tex]
Explanation:
Time can be found by dividing the distance by the speed.
[tex]t=\frac{d}{s}[/tex]
The distance is 45 meters and the speed is 12.5 meters per second.
[tex]d= 45 \ m \\s= 12.5 \ m/s[/tex]
[tex]t=\frac{45 \ m}{12.5 \ m/s}[/tex]
Divide. Note that the meters, or "m" will cancel each other out.
[tex]t=\frac{45 }{12.5 \ s}[/tex]
[tex]t=3.6 \ s[/tex]
It will take the dolphin 3.6 seconds to swim a distance of 45 meters are 12.5 meters per second.
