HCU MCA 2015 Paper

The petrol tank of a motor cycle has a capacity of 11 liters, where 2.5 liters are held in reserve. Initially 6 liters of petrol was filled. The odometer reads 21375 km, when the motor cycle comes to reserve. It was then driven fro another 98 km before 7 liters of petrol was filled. After a week, the motor cycle was again on reserve and the odometer reads 21718 km. What is the mileage given by of the motor cycle in kms per liter ?