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Digital-Logic-Design
October 9, 2023
Computer-Networks
October 9, 2023
Digital-Logic-Design
October 9, 2023
Computer-Networks
October 9, 2023

Scientific Assistance CS 15-10-2017

Question 2
Aamir and Birju can cut 5000g of wood in 20 min. Birju and Charles can cut 5000g of wood in 40 min. Charles and Aamir cut 5 kg of wood in 30 min. How much time Charles will take to cut 5 kg wood alone?
A
120 min
B
48 min
C
240 min
D
120 min
Question 2 Explanation: 
Here in this question 5000g means 5kg only
So from that question Aamir (A) Birju (B) Charles (C)
Let Aamir, Birju and Charles alone can complete the work in A, B and C minutes respectively, then
1 min. work of (A+B)=1/20, (B+C)=1/40 and (C+A)=1/30
A + B + C = 13/240
1 min. work of C = (A+B+C) – (A+B) = 13/240 – 1/20 = 1/240
So C alone can complete the work in 240 min.
Correct Answer: C
Question 2 Explanation: 
Here in this question 5000g means 5kg only
So from that question Aamir (A) Birju (B) Charles (C)
Let Aamir, Birju and Charles alone can complete the work in A, B and C minutes respectively, then
1 min. work of (A+B)=1/20, (B+C)=1/40 and (C+A)=1/30
A + B + C = 13/240
1 min. work of C = (A+B+C) – (A+B) = 13/240 – 1/20 = 1/240
So C alone can complete the work in 240 min.
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