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What order should they cross to get everyone across and get to the concert?

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Four members of a band are walking to a night concert.
They decided to take a short-cut, but must cross a bridge.
Luckily they have one flashlight. Because of the varying size of their instruments, it takes each member a different amount of time to cross the bridge - it takes the first person one minute, the second person two minutes, the third person five minutes and the fourth person ten minutes.
They must cross the bridge in pairs, travelling at the slower speed so if the one minute person went with the ten minute person, it would take a total of ten minutes. Since there is only one flashlight, one person must come back across the bridge, then another pair can cross.
They only have 17 minutes to cross the bridge and still get to the concert on time.
What order should they cross to get everyone across and get to the concert?

posted Aug 21, 2018 by Aastha Joshi

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1 Answer

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  1. The 1 min person & the 2 min person cross the bridge- total of 2 minutes,
  2. The 1 min person comes back with flashlight - total of 3 minutes,
  3. The 5 min person & the 10 min person cross the bridge- total 13 minutes,
  4. The 2 min person goes back- total of 15 minutes,
  5. The 1 min person & 2 min person cross together- total of 17 minutes
answer Aug 21, 2018 by Hanifa Mammadov

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