B. 32 min
Feedback Given that the diameters of the three pipes are 2 cm, 3 cm and 4 cm
From the given data,
Amount of water from three pipes is 4 units, 9 units and 16 units.
Let the capacity of cistern be 'p' units.
p/58 = 16
p = 928 units.
In 1 minute, quantity to be filled by 3 pipes = 29 units
Total time required = 928/29 = 32 minutes.