Henry Ernest Dudeney/Puzzles and Curious Problems/74 - The Omnibus Ride

by : $74$

 * The Omnibus Ride
 * George treated his best girl to a ride on a motor omnibus,
 * but on account of his limited resources it was necessary that they should walk back.
 * Now, if the bus goes at the rate of nine miles an hour and they walk at the rate of three miles an hour,
 * how far can they ride so they may be back in eight hours?