While working on a case Dr. Watson accidentally fell down a 30 foot dry
wishing well. Sherlock Holmes lowered him down a rope.
"Can you climb up?" shouted Holmes.
"I'll be out before you know it!" came Watson's reply.
But the climb wasn't as easy as Watson had first imagined. Each hour
he managed to climb 3 feet - but slipped back 2 feet.
How long did it take Watson to get out?