Posted by Nataliestom House T on Tuesday, February 1, 2011 at 8:41pm.
The tip of the minute hand of Boston's Custom House Tower clock travels 6ft. 10 in. in 5 minutes.How long is the minute hand ?

Math  Reiny, Tuesday, February 1, 2011 at 8:54pm
5 minutes is 1/12 of a rotation
so
(1/12)(2pi r) = 82 inches
r = 82(12)/(2pi)
= you do the buttonpushing