
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
Lewis drives from London to Brighton at an average speed of \(60 \mathrm{mph}\). On the way back, he gets stuck in traffic and his average speed is only \(40 \mathrm{mph}\). What is his average speed for the whole journey?
A) \(55 \mathrm{mph}\) B) \(50 \mathrm{mph}\) C) \(48 \mathrm{mph}\) D) \(45 \mathrm{mph}\) E) Impossible to determine

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