Solve this puzzle??? RRS feed

  • Question


    There are two lengths of rope.
    Each one can burn in exactly one hour.
    They are not necessarily of the same length or width as each other.
    They also are not of uniform width (may be wider in middle than on the end), thus burning half of the rope is not necessarily 1/2 hour.

    By burning the ropes, how do you measure exactly 45 minutes worth of time?
    Friday, September 21, 2007 6:10 PM

All replies

  • hey u shud post such postss in the general section

    neways heres the soln

    Light both ends of rope A and one end of rope B. After 30 minutes, rope A will be completely burned up and there will be 30 minutes of rope B left. Light the other end of rope B; it will burn up in 15 minutes. Total time elapsed since starting the ropes on fire: 45 minutes
    Saturday, September 22, 2007 9:31 AM