Postal or Sorting Assistants Model Paper 7 With Solutions

Question : 13 of 100

Marks: +1, -0

Three pipes A, B and C can fill a cistern in 6 hours. After working at it together for 2 hours, C is closed and A and B can fill the remaining part in 7 hours. The number of hours taken by C alone to fill the cistern is:

Validate

Solution:

1/A+1/B+1/C=1/6

hi two hours, work completed

2/6=1/3

Remaining work =

1-1/3=2/3

7[1/A+1/B]=2/3

1/A+1/B=2/21

1/C=1/6-2/21

1/C=1/14

C= 14 hours

Go to Question:

Prev Question

Next Question