A cubical tank of edge 50 cm is filled with water to the brim. Water is pumped out at 15 litres a minute.<hr>It takes <input min="0" type="number" id ="imp5pg240q6_1" class="lineinput" placeholder="?" /> minutes <input min="0" type="number" id ="imp5pg240q6_2" class="lineinput" placeholder="?" /> seconds to pump out all the water.