What percentage of colonists were:
loyalists:
patriots:
neutral:

Google says:

20% were loyalists

45% were Patriots

And there was no info. on neutralists, but suggesting there were only 3 groups, and Patriots and loyalists were 65%, then neutralists are 35%

ok, so basically your gonna start with 350 ok. so there's 60 seconds in a minute so that means you he can go up 10 ft per minute. soo, after 3 minutes he should be at 260 ft after three minutes : )