Selected MCQ

Current Question
In a week, working hours are 8 per day. A man earns Rs. 2.40/hour and Rs. 3.20/hour for overtime. Total earnings were Rs. 432 in 4 weeks. How many hours worked?
  • A. 160
  • B. 175
  • C. 180
  • D. 195
Correct Answer: B
Explanation:
Solving the linear Equation gives 175 houRs.
Related Question 1
A tap fills a tank in 6 houRs. After half filled, three more taps are opened. Total time is ____.
  • A. 3 hr 15 min
  • B. 3 hr 45 min
  • C. 4 hr
  • D. 4 hr 15 min
Correct Answer: B
Explanation:
Rate increases after half fill.
Related Question 2
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.
Related Question 3
Three pipes fill a tank. The first two together take 15 houRs. Find total time.
  • A. 6 hrs
  • B. 10 hrs
  • C. 15 hrs
  • D. 30 hrs
Correct Answer: C
Explanation:
Combined rate leads to 15 houRs.
Related Question 4
Pipes A, B, C fill tank in 12, 15, 20 houRs. If A alone works, time required is ____.
  • A. 6 hrs
  • B. 6⅔ hrs
  • C. 7 hrs
  • D. 7½ hrs
Correct Answer: C
Explanation:
Based on the given combination.
Related Question 5
Pipes A, B, C fill tank in 12, 15, 20 houRs. Find time together.
  • A. 6 hours
  • B. 6⅔ hours
  • C. 7 hours
  • D. 7½ hours
Correct Answer: C
Explanation:
Combined rate method.