Selected MCQ

Current Question
P and Q complete work in 8 days, Q and R in 12 days. Time for all three is ____.
  • A. 7
  • B. 8
  • C. 9
  • D. 10
Correct Answer: B
Explanation:
Combined work rate leads to 8 days.
Related Question 1
P completes work in 24 days, Q in 9 days, R in 12 days. Time taken together is ____.
  • A. 10
  • B. 9
  • C. 11
  • D. 12
Correct Answer: A
Explanation:
Sum of rates gives time = 10 days.
Related Question 2
P and Q complete work in 20 and 12 days. Time together is ____.
  • A. 5 days
  • B. 10 days
  • C. 15 days
  • D. 12 days
Correct Answer: B
Explanation:
The combined rate gives 10 days.
Related Question 3
Kamal completes work in 20 days. Suresh is 25% more efficient. Time taken by Suresh is ____.
  • A. 14
  • B. 16
  • C. 15
  • D. 11
Correct Answer: B
Explanation:
Efficiency ↑25% → time = 20/1.25 = 16 days.
Related Question 4
C completes half the work in 6 days, D completes 1/3 in 5 days. Total time taken?
  • A. 10 days
  • B. 12 days
  • C. 8 days
  • D. 9 days
Correct Answer: A
Explanation:
Combined rates calculation.
Related Question 5
A and B can complete work in 12 days; B and C in 15 days; C and A in 20 days. A alone time ____.
  • A. 20 days
  • B. 30 days
  • C. 40 days
  • D. None
Correct Answer: B
Explanation:
Use the system of equations.