.
. .
.
Subj:.....Walking From The Train Station (S583) 
          From: Puzzles And Brain Teasers on 3/25/2008 
 Source: http://www.apuzzlezone.com/adailypuzzle/03-25-08.html 

A man hires a taxi to meet him at the railroad station at 
3pm to take him to an appointment.  He catches an earlier 
train and arrives at 2.  He decides to start walking, and 
is picked up en route by the taxi.  He arrives twenty 
minutes early for his appointment.  How long did he walk? 
 
 
 
 

                  THE SOLUTION

He walked 50 minutes; the taxi saved 10 minutes going and
10 minutes coming back.
.
.

.