Pipes and Cisterns aptitude questions and answers for competitive exams. Pipes and Cisterns MCQs for test preparation and entry tests. Pipes and cisterns mcq with answers, Pipes and cisterns mcq pdf download and mathematics mcqs with answers pdf.
Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If A is open all the time and B and C are open for one hour each alternately, the tank will be full in _____ ?
A. 7 hours
B. 7 1/2 hours
C. 6 hours
D. 6 2/3 hours