Riddle Time!! Please help!?!


Question: Alright folks. There are 4 hikers. And they are all stuck on a mountain. And they need to get to their cabin in 15 hours. They only have one flashlight and no one can travel without the flashlight. There is a bridge halfway between the mountain and the cabin and only two people can be on the bridge at a time. One hiker takes 1 hour to get to the cabin. One takes 2 hours. One takes 4 hours. and One takes 8 hours. How do they all get to the cabin in 15 hours???

I can't figure it out... lol. Anyone have some insight?
Please and Thanks!


Answers: Alright folks. There are 4 hikers. And they are all stuck on a mountain. And they need to get to their cabin in 15 hours. They only have one flashlight and no one can travel without the flashlight. There is a bridge halfway between the mountain and the cabin and only two people can be on the bridge at a time. One hiker takes 1 hour to get to the cabin. One takes 2 hours. One takes 4 hours. and One takes 8 hours. How do they all get to the cabin in 15 hours???

I can't figure it out... lol. Anyone have some insight?
Please and Thanks!

Lets say A,B,C and D are four ppl who takes 1,2,4 and 8 hrs resp to cross the bridge.
First A and B will go and A will come back -- time taken = 2+1=3
Then C and D will go and B will come back -- time taken = 8+2=10
Then A and B will go together. -- time taken = 2
Total = 3+10+2 = 15hrs and all have crossed the bridge

Isn't 1+2+4+8 = 15?

?????? 1+2+4+8 = 15

?? sorry..

its really easy if you took the time to add it up. 1+2+4+8 =15

Why don't they all walk to the bridge together at the pace of the slowest one. Then the 2 fastest cross the bridge, 1 comes back & takes the 3rd. 1 comes back again and takes the 4th, then they all travel on to the cabin with plenty of time to spare providing that the bridge crossing part did not take longer than 7 hrs.

BTW- is the length of time crossing the bridge relevant? that info was not in the question

That's tricky, if u got the answer can u please email it?
Thanks



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