[ A ] 10 hrs. 

[ B ] 12 hrs.  
[ C ] 14 hrs.  
[ D ] 16 hrs. 
[ A ] 10 hrs. 

[ B ] 12 hrs.  
[ C ] 14 hrs.  
[ D ] 16 hrs. 
Answer : Option C 
Explanation : 
Part filled in 2 hours = $2 \over 6$ = $1 \over 3$ Remaining part = 1  $1 \over 3$ = $2 \over 3$ So,(A+B) ;s 7 hours's work = $2\over 3$ So,(A+B);s 1 hour's work = $2 \over 21$ C's1 hour's work =(A+B+C)'s One hourr's work (A+B)'s one hour's work = ($1 \over 6$  $2 \over 21$) = $1 \over 14$ C alone can fill the tank in 14 hours 
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