SarkariPYQ

SSC CPO 2019 PYQ — Question 143

SSC CPO Tier I - 9th December 2019 - Shift 1 • Quantitative Aptitude • Q143

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The given bar chart represents the average marks obtained in English (E) and vernacular (V) by the students of five districts (D1, D2, D3, D4, D5)in a state at the secondary level examination of a particular year (marks secured out of a total of 100).

Three pipes, A, B, C can fill an empty cistern in 2, 3 and 6 hours respectively. They are opened together. After what time should B be closed, so that the cistern gets filled in exactly 1 hr 15 min?

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Correct answer: A

Explanation

The correct answer is Option 1  i.e. 30 min

Understanding

Application

Let the capacity of the cistern = LCM of (2,3,6) = 6 liter

A’s efficiency = 3

B’s efficiency = 2

C’s efficiency = 1
 

According to the Question

(3 + 1) ×  + 2t = 6

t = 1/2 hours

= 30 min