If Prem goes from City a to city b at three different speeds 30 km per hour 40 km per hour and 60 km per hour ,covering the same distance with each respective mileage per litre of fuel are 11 km 14 km and 18 kilometre for the above speeds speeds. Prem's friend Neel is an efficient driver and wants to minimise his friends cars fuel consumption so he decides to drive frames ka oneday from City a to city B. how much fuel will he be able to save?