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200l = 24 menit
Kedua pompa bekerja secara bersamaan maka diasumsikan masing-masing pompa dibebankan 1/2.
a) 100 : 2 = 15 : 2
50l = 7,5 menit
b) 200 : 2 = 24 : 2
100 : 2 = 12 : 2
50l = 6 menit
Maka 7,5 + 6 = 13,5 menit