<PRE><B>Question 1188393</B>
John filled the gas tank of his car with 32.4 litres of gas just before starting on a trip.
 He noticed that the odometer read 30803 km as he left the gas station.
 When he stopped for lunch, he saw the next palindrome on his odometer.
that would be 30903
:
 He then filled up with 42 litres of gas at the palindrome after the one he saw 
 at lunch.
that would be 31013
:
find the total dist since fillup;  31013 - 30803 = 210 km
:
 What was the averages number of litres per 100 km used by his car during the trip?
42/2.1 = 20 liters per 100 km</PRE>