Henry Ernest Dudeney/Puzzles and Curious Problems/70 - The Donkey Cart

by : $70$

 * The Donkey Cart
 * Atkins, Brown and Cranby had to go an journey of $40$ miles.
 * Atkins could walk $1$ mile an hour,
 * Brown could walk $2$ miles an hour,
 * and Cranby could go in his donkey-cart at $8$ miles an hour.
 * Cranby drove Atkins a certain distance, and, dropping him to walk the remainder,
 * drove back to meet Brown on the way and carried him to their destination,
 * where they all arrived at the same time.


 * How long did the journey take?


 * Of course, each went at a uniform rate throughout.

Also see

 * Henry Ernest Dudeney/Modern Puzzles/37 - A Side-car Problem, exactly the same problem but with different numbers