Yes, it is. One of the current Australian residential walking records is: a shade over 60 kilometers
in 6 hours, which boils down to about 167 meters every minute for 6 solid hours.
That doesn't mean that you or I could do it, but to answer your question: Yes, it's possible.
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assuming walking speed = 100 meter/minute 1200 meters take 1200/100 = 12 minutes
about 1/4 mile _____________________________________________________________ Assuming 100 meter/minute, then he will walk around 500 meters or around 1/2 a kilometer.
You didn't tell us how long it took to walk those 3.33 meters, so it is impossible to know how long 100 meters would take.
500 meters/5 minutes = 100 meters per minute.
You would walk one metre in 3.8/6 = 19/30 seconds. Therefore, 100 metres would take 19/30 x 100 = 63.3 recurring (that is, 63.333...) seconds.