Final answer:
A top swimmer can swim across a 25-meter pool in 12 seconds.
Step-by-step explanation:
To find how fast a top swimmer can go, we need to convert the time taken to swim across a 25-meter pool into a speed. The given time is 1/5 of a minute. Since 1 minute is equal to 60 seconds, we can convert 1/5 of a minute to seconds by multiplying it by 60.
1/5 * 60 = 12 seconds.
Therefore, a top swimmer can swim across a 25-meter pool in 12 seconds.