
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
In a similar setup with valves $D$, $E$, and $F$, the tank fills in 2 hours when all three valves are open, in 3 hours with only $D$ and $F$ open, and in 4 hours with only $E$ and $F$ open. Determine the number of hours required to fill the tank with only valves $D$ and $E$ open.
A) 2.1
B) 2.2
C) 2.3
D) 2.4
E) 2.5

Present the answer in LaTex format: \boxed{Your answer}
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