In how many days will he cross the desert ? Solution Details

However, our explorer doesn't manage very well with the camel, and he doesn't find again his food dumps in the desert (because of chacals maybe...).
He decides to use bearers. Each bearer, as well as explorer,
can carry 20 days of food for one man (as much as a camel, consider a bearer = a camel + a driver).
The explorer ends alone, and all bearers return to the starting point.
Each bearer must do only one go and return.

How many bearers are required to cross a 30 days desert in 30 days ?
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How could he manage to cross a 40 days desert in 40 days ? Solution Details

The explorer wants now to visit a desert site at a distance of 30 days.
He wants to go **and return** in exactly 60 days.
Each bearer must do only one go and return. There is no food at arrival either.

How many bearers ?
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What if the steps are integral numbers of days ? Solution Details

Because of chacals, no food dumps are allowed. How many bearers ? Solution Details