If you set out to walk 10 miles,

[elperromagico]

on the first day walking five miles and on each subsequent day walking half of the previous day's distance, how long will it take you to reach 10 miles?

Day 1: 5 miles walked (5 miles total)
Day 2: 2.5 miles walked (7.5 miles total)
Day 3: 1.25 miles walked (8.75 miles total)
Day 4: 0.625 miles walked (9.375 miles total)
Day 5: 0.3125 miles walked (9.6875 miles total)
Day 6: 0.15625 miles walked (9.84375 miles total)
Day 7: 0.078125 miles walked (9.921875 miles total)

Of course, some will say that you will never reach ten miles.

This is incorrect. In actuality, you will reach 10 miles on the seventh day, because you will say "fuck it" and walk the extra 0.078125 miles.