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it is a case of direct variation ...........
time taken to use 40 litre = 8 hrs
time taken to use 1 litre = 8/40 hrs
time taken to use 150 litres = 8/40*150 = 30 hrs
time taken to use 40 litre = 8 hrs
time taken to use 1 litre = 8/40 hrs
time taken to use 150 litres = 8/40*150 = 30 hrs
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