Task: Question Answering
Input (English): Problem: if 9 engines consume 24 metric tonnes of coal , when each is working 8 hoursa day , how much coal will be required for 8 engines , each running 13 hours a day , it is being given that 3 engines of former type consume as much as 4 engines of latter type ? 
Options: a ) 23 , b ) 25 , c ) 26 , d ) 28 , e ) 30
Output (English): c