A cistern can be filled by a tap in 5 hours while it can be emptied by another tap in 6 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled ? Answers:  A) 4.5 hrs  B) 5 hrs  C) 6.5 hrs  D) 7.2 hrs  E) 30 hrs
Net part filled in 1 hour= 1/5 -1/6= 1/30   Therefore the cistern will be filled in 30 hours .   ANSW30 hrsR:30 hrs
<result>E</result>
A cistern can be filled by a tap in 5 hours while it can be emptied by another tap in 6 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled ?