digging a hole John, Jim & Jack are digging identical holes in a field. When John works with Jim, they dig 1 hole in 4 days. When John works with Jack, they dig 1 hole in 3 days. When Jim works with Jack, they dig 1 hole in 2 days. Working alone, how long does it take John to dig 1 hole? Congratulations to these solvers as of Pavel Doktor, Albert Frank, Juan Luis Gonzalez, Joshua Green, Barry Highbloom, Henryk Kalafut, Chiedu Maduekwe, Steve Steppe, Sergey Turko, Luc Vingerhoets and Jay Willner. |
