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If 6 engines consume 15 metric tonnes of coal when each is running 9 hours a days , how much coal are needed for 8 engines, each running 12 hours a days, it being given that 3 engines of former type consume as much as 4 engines of latter type?

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If 6 engines consume 15 metric tonnes of coal when each is running 9 hours a days , how much coal are needed for 8 engines, each running 12 hours a days, it being given that 3 engines of former type consume as much as 4 engines of latter type?






 
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