Jawabanmu

2014-04-06T20:14:56+07:00
R = 20 cm
t =1,4 m = 140 cm

V tabung = Luas alas x t 
                = 3,14 x 20 cm x 20 cm x 140 cm
                =175.840 cm3
                = 175,84 dm3
                = 175,84 liter

Waktu yang diperlukan  = 175,84 / 4
                                       = 43,96 menit
                                       = 44 menit