The way I understand what you're saying (which isn't too clear),

all he has to do is have 3 "foods" at the 40 point (end of day2);

then he takes all 3, eats one 40-60, one 60-80 and one 80-100.

Results 1 to 9 of 9

- October 28th 2009, 08:32 AM #1

- Joined
- Jun 2009
- Posts
- 77

## problem!!

There is a trip between A to B of 100km.

It is divided into 5 parts of 20 km each

A man needs to cover this distance

He can cover 20 km in each day

At A unlimited quantity of food is there

For every 20 km the man needs to take 1 food

the man can carry a maximum of three foods

he can drop the food in between the path wherever he likes

how will he reach the destination

- October 28th 2009, 12:06 PM #2

- Joined
- Dec 2007
- From
- Ottawa, Canada
- Posts
- 3,184
- Thanks
- 80

- October 28th 2009, 08:37 PM #3
Do you know the answer? (Read http://www.mathhelpforum.com/math-he...-subforum.html)

- October 29th 2009, 01:22 AM #4

- Joined
- Jun 2009
- Posts
- 77

- October 29th 2009, 03:35 AM #5

- Joined
- Dec 2007
- From
- Ottawa, Canada
- Posts
- 3,184
- Thanks
- 80

Ok then, since you KNOW the answer:

*I think your problem can be re-worded this way:*

*Jack needs to get from A to B, a distance of 100 km.*

*Jack can only walk 20 km each day.*

*At A is an unlimited number of water bottles.*

*Jack needs to drink one bottle of water for each 20 km.*

*And Jack can carry a maximum of only 3 bottles.*

*Jack may leave bottles at any spots from A to B.*

*How can Jack reach B ?*

*My solution:*

*1: take 3 bottles, walk 20 km, leave one at 20 km, return : 2 days*

*2: repeat 3 more times: total 8 days (4 bottles at 20 km)*

*3: go to 20 km : total 9 days (6 bottles at 20 km)*

*4: repeat above for 3 days: total 12 days (3 bottles at 40 km)*

*5: walk the remaining 60 km, drinking 1 bottle each day: total 15 days.*

*That's a "quick" solution, since you did not specify MINIMUM.*

- October 30th 2009, 12:32 AM #6

- Joined
- Nov 2005
- From
- someplace
- Posts
- 14,972
- Thanks
- 5

MrF means: "do you know how to solve this?" and not "is the answer at the back of the book?".

If you do know how to solve this and you have posted this as a challenge to other member then this is where the question belongs.

However if you do not know how to solve this and are look for help in solving it then it is not a challenge problem as defined in this forums title.

The question is being asked of this problem because to the staff it looks like the latter rather than the former

CB

- October 30th 2009, 06:07 AM #7

- Joined
- Jun 2009
- Posts
- 77

- October 30th 2009, 06:33 AM #8

- Joined
- Dec 2007
- From
- Ottawa, Canada
- Posts
- 3,184
- Thanks
- 80

- November 2nd 2009, 04:12 AM #9