72
Q:
A) 6 hrs | B) 20/3 hrs |
C) 7 hrs | D) 15/2 hrs |
Answer: C) 7 hrs
Explanation:
Explanation:
(A+B)'s 1 hour work=(112+115)=960=320
(A+C)'s 1 hour work=(112+120)=860=215
part filled in 2 hrs=(320+215)=1760
part filled in 6 hrs=(3*1760)=1720
remaining part =(1-1720)=320
Now, it is the turn of A and B (3/20) part is filled by A and B in 1 hour.
Therefore, Total time taken to fill the tank =(6+1)hrs= 7 hrs