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Vijay Kushwaha

· started a discussion

· 1 Months ago

ans is wrong (Question: 217526.0 )

ans will be 10hr

Question:
Two pipes A and B can fill an empty tank in 12 hours and 15 hours respectively. while pipe C can empty the tank in 20 hours. If all the three pipes are opened, then after how much time the pipe A should be closed so that the tank be filled in 20 hours ?
Options:
A) 10 hours
B) 8 hours 
C) 6 hours
D) 5 hours
Solution:
Ans: (b)



Alternate sol.


A can fill the tank in 1 hour = 1/12

B can fill the tank in 1 hour = 1/15

C can empty the tank in 1 hour= 1/20


B and C can fill the tank in 1 hour= 1/15 - 1/20 = 1/60

B and C can Fill the tank in 20 hour= 1/60*20=1/3

Remaining part of the tank 1-1/3=2/3

 A takes X time to  fill the remaining part of the tank. 


1/12*(X) = 2/3

X = 8 hour. 


Knowledge Expert

· commented

· 1 Months ago

Dear Student,

Given answer is correct, we fixed its detailed solution.

Keep learning with us!!
Best wishes
Team Toprankers

VIKRANT THAKUR

· commented

· 1 Months ago

8 hrs is the right ans ..
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