Answer:
about 16 hours of their day in water
Explanation:
A full day is 24 hours and if the hippo spends 2/3 of those 24 hours, it would be 16 hours. To find 2/3 of 24, you divide 24 by 3, which you can see is the denominator of the fraction. This gives you 8, and since it is 2 thirds, you multiply that 8 by 2.
16 is your answer.
hope this helps