Pipe A can fill an empty tank in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins. If all of them work together, find the time taken to fill the tank?
A. 17 1/7 mins
B. 20 mins
C. 8 mins
D. none of these
Answer:A
Pipe A can fill an empty tank in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins. If all of them work together, find the time taken to fill the tank?
A. 17 1/7 mins B. 20 mins C. 8 mins D. none of these