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5:4 i’m not quite sure but i think it would be 5:4
Answer:
The rate of change of water in the pool is 400 gallons / hour
Step-by-step explanation:
We are given
At 6:00 AM:
there were 400 gallons of water in the pool
so,

At 11:00 AM:
there were 2400 gallons of water in the pool
so,

now, we can find time between
t=11-6=5 hours
now, we can use formula
rate of change of water in pool is
=( change in water quantity)/( total time)
so, we get

now, we can plug values



So,
The rate of change of water in the pool is 400 gallons / hour
The pencil will be 190 millimeters
i believe 2/21 is the answer, correct if im wrong