6. Mr Smith commutes to the city regularly and invariably takes the same train home which arrives at his home station at 5 P.M.. At this time, his chaiffer always just arrives, promptly picks him up, and drives him home. One fine day, Mr. Smith takes an earlier train and arrives at his home station at 4.PM. Instead of waiting for his chauffer until. 5 P.M., he starts walking home. On his way he meets the chauffer who picks him up promptly and returns home arriving 20 minutes earlier than usual, Determine the time Mr. Smith meets the chaufer?
a 4:30 PM
b. 4:35 P.M. c. 4:40P.M. d. 4:50 P.M.