Question
A van uses 12 litres of petrol for every 40 km it travels when its average driving speed is 75 km/h. It uses 6 litres of petrol for every 90 km it travels when its average driving speed is 60 km/h. How much petrol will the van consume for a journey which lasts 15 h if it travels at 75 km/h for the first 6 hours and 60 km/h for the rest of the journey?
4 m

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A van uses 12 litres of petrol for every 40 km it travels when its average driving speed is 75 km/h. It uses 6 litres of petrol for every 90 km it travels when its average driving speed is 60 km/h. How much petrol will the van consume for a journey which lasts 15 h if it travels at 75 km/h for the first 6 hours and 60 km/h for the rest of the journey?