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If 5 engines consume 6 metric tonnes of ...

If 5 engines consume 6 metric tonnes of coal when each is running 9 hours a day, how many metric tonnes of coal will be needed for 8 engines, each running 10 hours a day, it being given that 3 engines , of the former type consume as much as 4 engines of the latter type? `3 1/8` b. `8` c. `8 8/9` d. `6(12)/(25)`

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