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Pipa A => 1200Liter/20menit= 60liter/menit
Pipa B => 1200Liter/30menit= 40liter/menit
waktu = 1200/ (A+B)
= 1200/(60+40)
= 12menit
jdi klau pke 2 pipa cuma butuh 12menit
Nomor 10
drum A= 780liter
drum B= 0 liter
selang = 12liter/menit
waktu = 1/2jam = 30 menit
volume drum B= 12literx30menit= 360liter
selisih= 780-360
=420liter