Answer:
She will arrive at 3:23 to the pool.
Explanation:
Since Natasha takes 33 minutes to walk through the pool from her house.
Also, if she rides a bike then that time is 1/3 times reduced.
So total time to ride the bike from her house to the pool is

Now, If she leaves the house at 3:12 then she will reach to the pool is 3 hours 12 minutes + 11 minutes = 3 hours 23 minutes = 3:13
Hence, She will arrive pool at 3:23.