Armed Forces Police Math Exams Quizzes MCQs Quizzes Time, Distance and Work

Question:
A cistern normally filled in 8 hours, takes 2 hours longer due to a leak. If the cistern is full the leak shall empty it in.

Option A):
24 hours
Option B):
40 hours
Option C):
20 hours
Option D):
30 hours

Correct Answer is Option B):
40 hours

Explanation:
Solution:
Normally portion of the cistern filled in on
hr = 1/8
Due to leakage the portion filled per hour
= 1/10
Leakage per hour = 1/8 - 1/10
= 5 - 4/40 = 1/40