Henry Ernest Dudeney/Puzzles and Curious Problems/200 - Measuring the River

by : $200$

 * Measuring the River
 * A traveller reaches a river at the point $A$,
 * and wishes to know the width across to $B$.


 * Dudeney-Puzzles-and-Curious-Problems-200.png


 * As he has no means of crossing the river, what is the easiest way of finding its width?