Selected MCQ

Current Question
A can do work 3 times faster than B. If together they finish in 32 hours, how long does A take alone?
  • A. 32 hours
  • B. 48 hours
  • C. 3 days
  • D. 4 days
Correct Answer: A
Explanation:
Work ratio simplifies to A alone time.
Related Question 1
Jameel completes a task in 15 hours and Nasir in 10 houRs. Together they finish in ____.
  • A. 12:00 pm
  • B. 2:00 am
  • C. 12:00 am
  • D. 10:00 pm
Correct Answer: C
Explanation:
Combined rate gives time ≈ 6 hours → midnight.
Related Question 2
A alone finishes work in 10 days, B in 15 days if they work together, total days ____.
  • A. 35
  • B. 40
  • C. 45
  • D. None
Correct Answer: C
Explanation:
Combined work rate.
Related Question 3
P lays railway track in 16 days. Q does the same in 24 days. Together they finish in ____.
  • A. 9⅗ days
  • B. 9⅕ days
  • C. 9⅖ days
  • D. 10 days
Correct Answer: A
Explanation:
The combined rate yields 9⅗ days.
Related Question 4
P and Q complete work in 15 and 10 days. Together they complete in ____.
  • A. 6
  • B. 12
  • C. 22
  • D. 20
Correct Answer: A
Explanation:
Combined rate = 1/15 + 1/10 = 1/6 → time = 6 days.
Related Question 5
One pipe fills a tank three times as fast as another. Together they fill in 36 minutes. The time taken by the slower pipe is ____.
  • A. 81 min
  • B. 108 min
  • C. 144 min
  • D. 192 min
Correct Answer: C
Explanation:
Let slow rate = x → total = 4x → gives 144 min.