question_answer

There are three taps to fill a tank whose diameters are 1 cm, \[\mathbf{1}\frac{\mathbf{1}}{\mathbf{3}}\] cm and 2 cm. The tap having the biggest diameter can fill the tank in 61 minutes. If all the three taps are opened together then in how many minutes the tank will be full? It is given that the flow of water in each tap is directly, proportional to the square of the diameter,       

A)                20 minutes        

B) 36 minutes   

C) 18 minutes                                            

D) 38 minutes

E) None of these