Beatles Bridge
The Beatles are stuck on the opposite side of a dark bridge from their concert, which starts in 17 minutes. The bridge can only take 2 people across at a time, and there's only one flashlight. The flashlight is required to cross. Ringo can cross in 1 minute, George in 2 minutes, Paul in 5 minutes, and John in 10 minutes. What order do they cross and return so that they are all across in time? (Write the answer in the minutes each trip takes without commas or spaces. If it's a ten, just put 0 instead. For example, 02215). There are technically 2 answers, though they work the same way. If you think your solution is right, try rearranging things.
The answer is 21022.
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1 solution
George and Ringo cross (2 min). Ringo returns (1 min). Paul and John cross (10 min). George returns (2 minutes). Ringo and George cross (2 min). 2 + 1 + 10 + 2 + 2 = 17 (21022)