Two pipes can fill a tank in 15 hrs and 20 hrs resoectively, while the third can empty it in 30 hrs. If all the pipes are opened simultaneously find the time required to fill the empty tank Share with your friends Share 0 Samirul Neshat answered this इसी पैटर्न पे बन जाएगा बस value चेंज करना है 1 View Full Answer