Question

Two pipes can independently fill an empty tank in 20 minutes and 30 minutes respectively. An emptying pipe
can empty a full tank in 10 minutes. In how many minutes will full tank become empty if all the three pipes are
opened simultaneously?
Select one:
a. Cannot be determined
b. 45
c. 60
d. 5 & 5/11​

Answer 1

Answer:

a No

b 67

c 45

d 55

Step-by-step explanation:

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so answer in annual function