"If 9 engines  consume 24 metric tonnes of coal, when each is working 8 hours a day;
Channel: Doubtnut
Date: 2020-04-12

"If 9 engines
  consume 24 metric tonnes of coal, when each is working 8 hours a day; how
  much coal will be required for 8 engines, each running 13 hours a day, it
  being given that 3 engines of former type consume as much as 4 engines of
  latter type?"