a pump can fill a tank with a water in 2 hours . because of a leak , it took 2 x 1 / 3 hours to fill the tank . the leak can drain all the water of the tank in
"sol . work done by the leak in 1 hour = ( 1 / 2 - 3 / 7 ) = 1 / 14 . ∴ leak will empty the tank in 14 hrs . answer d"
divide(const_1, subtract(divide(const_1, 2), divide(const_1, add(2, divide(1, 3)))))