Henry Ernest Dudeney/Modern Puzzles/46 - Baxter's Dog/Solution

by : $46$

 * Baxter's Dog

Solution

 * $10$ miles.

Proof
This is a variant on The Bulldozers and the Bee.

During the first hour, Anderson walks $2$ miles.

Baxter walks twice as fast, so catches up with Anderson after the latter has walked another $2$ miles, taking another hour to do so.

During that hour, the dog travels at $10$ miles an hour.

Thus the dog runs $10$ miles.