Selected MCQ

Current Question
If P takes twice time of Q and thrice of R, total time taken is ____.
  • A. 7
  • B. 8
  • C. 9
  • D. 6
Correct Answer: D
Explanation:
Relative ratios simplify to 6.
Related Question 1
The time taken upstream is twice that downstream. Find the speed relation.
  • A. 12 km/h
  • B. 13 km/h
  • C. 14 km/h
  • D. 15 km/h
Correct Answer: C
Explanation:
Solve using the speed ratio method.
Related Question 2
If P works alone takes same time as Q and R together, time taken by P is ____.
  • A. 30 days
  • B. 25 days
  • C. 20 days
  • D. 15 days
Correct Answer: B
Explanation:
Based on the equality of work rates.
Related Question 3
In a journey of 24 miles, two-thirds of the distance is covered at 40 mph. Total time taken is ____.
  • A. 14.4 min
  • B. 20 min
  • C. 28.8 min
  • D. 32 min
Correct Answer: D
Explanation:
Total time computed by segment speeds gives 32 minutes.
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 tank is filled in 5 hours by three pipes, A, B, and C. If C is twice as fast as B, find the total time.
  • A. 20 hrs
  • B. 25 hrs
  • C. 35 hrs
  • D. Cannot be determined
Correct Answer: C
Explanation:
Solve rate equations.