Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank? November 26, 2019 by Rimpa a) 10 min. 20 sec. b) 11 min. 45 sec. c) 12 min. 30 sec. d) 14 min. 40 sec. View AnswerOption – d. Similar QuestionsHow many Types of Soil in India?Observe the dots on a dice (one to six dots) in the following figures. How many dots are contained on the face opposite to that containing four dots?Animal without red blood cellsWhich new train is being flagged off by railway minister Suresh Prabhu in April 2017 ?When $720 is invested for 36 months it earns $205.20 simple interest. Find the yearly interest rate.Which Country has opened its fifth Nuclear Power Plant to meet its growing energy demands ?The wealthiest citizens of ancient rome wereWhat about Earth allows it to maintain bodies of water?The perimeters of two squares are 40cm and 32 cm. Find the perimeter of a third square whose area is equal to the difference of the areas of the two squares.India’s first-ever test flight powered by biojet fuel was successfully conducted by which airline?