H _
L _ _ V _ S
H _ S
H _ _ S _
_ T
7 . 1 5
_ N D
R _ _ C H _ S
S C H _ _ L
_ T
8 . 1 5 .
F R _ M
T H _
M _ C H _ N _
_ N D
T R _ C T _ R
S T _ T _ _ N
T _
T H _
R _ _ L R _ _ D
S T _ T _ _ N
_ S
1 / 3
-
1 / 4
=
1 / 1 2
_ F
T H _
W _ Y .
B _ R _ S
W _ L K S
_ T
_ N
5
M _ N _ T _ S ,
S _
T H _
W H _ L _
T R _ P
T _ K _ S
1
H _ _ R .
O N _ - F _ _ R T H
_ F
T H _
W _ Y
_ S
1 5
M _ N _ T _ S .
S _
H _
L _ _ V _ S
H _ S
H _ _ S _
_ T
7 : 1 5
_ N D
R _ _ C H _ S
S C H _ _ L
_ T
8 : 1 5 Clue
THE SON WILL CATCH UP WITH HIS FATHER IN 10 MINUTES. IN 10 MINUTES, THE SON WOULD HAVE TRAVELED HALF THE DISTANCE, SINCE HIS TOTAL TRAVELING TIME IS 20 MINUTES. THE FATHER STARTED 5 MINUTES EARLIER THAN THE SON, SO HE WOULD HAVE TRAVELED FOR A TOTAL OF 15 MINUTES WHEN HIS SON REACHED HIM. THEREFORE, THE FATHER WOULD HAVE ALSO TRAVELED HALF THE DISTANCE IN 15 MINUTES HE LEAVES HIS HOUSE AT 7.15 AND REACHES SCHOOL AT 8.15. FROM THE MACHINE AND TRACTOR STATION TO THE RAILROAD STATION IS 1/3 - 1/4 = 1/12 OF THE WAY. BORIS WALKS IT IN 5 MINUTES, SO THE WHOLE TRIP TAKES 1 HOUR. ONE-FOURTH OF THE WAY IS 15 MINUTES. SO HE LEAVES HIS HOUSE AT 7:15 AND REACHES SCHOOL AT 8:15 THE TRAIN IS ABOUT TO LEAVE AND YOU WILL NOT BE ABLE TO CATCH THE TRAIN. THE AMOUNT OF TIME TAKEN TO TRAVEL TO THE HALFWAY POINT AT 15 MILES AN HOUR IS THE SAME AMOUNT OF TIME TAKEN TO REACH THE TRAIN STATION WHEN TRAVELLING TO THE RAILROAD STATION AT 30 MILES AN HOUR. FOR EXAMPLE, LET'S ASSUME THAT THE DISTANCE TO TRAVEL IS 30 MILES. WHEN TRAVELLING AT 30 MILES AN HOUR, IT TAKES 1 HOUR. WHEN TRAVELLING AT 15 MILES AN HOUR, IT WILL ALREADY TAKE 1 HOUR TO REACH THE HALFWAY POINT AS THE PROBLEM SAYS THE APPRENTICE MIXED UP THE HANDS SO THAT THE MINUTE HAND WAS SHORT AND THE HOUR HAND WAS LONG. THE FIRST TIME THE APPRENTICE RETURNED TO THE CLIENT WAS ABOUT 2 HOURS AND 10 MINUTES AFTER HE HAD SET THE CLOCK AT SIX.THE LONG HAD MOVED OLNY FROM TWELVE TO A LITTLE PAST TWO. THE LITTLE MADE TWO WHOLE CIRCLES AND AN ADDITIONAL 10 MINUTES. THUS THE CLOCK SHOWED THE CORRECT TIME. THE NEXT DAY AROUND 7:O5 A.M.HE CAME A SECOND TIME,13 HOURS AND 15 MINUTES AFTER HE HAD SET THE CLOCK FOR SIX. THE LONG HAD, ACTING AS THE HOUR HAND,COVERED 13 HOURS TO REACH 1. THE SHORT HAND MADE 13 FULL CIRCLES AND 5 MINUTES, REACHING 7, SO THE CLOCK SHOWED THE CORRECT TIME AGAIN