
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
Two whales are swimming in Antarctic waters in a straight line at a speed of 6 km/h. Suddenly, one of them, without changing direction, started swimming faster at a speed of 10 km/h. Then, he abruptly turned back and swam towards the second whale who maintained both his speed and direction. Assume the whales separated at 8:15 am and met again at 10:00 am.

At what time did the faster whale turn back?

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