 
<translate> Tambaya: Bututu biyu na iya cika tanki a cikin awanni 20 da 12, yayin da bututu na uku zai sa tankin ya zama fanko a cikin awanni 20. Idan duk bututun guda uku suna aiki lokaci guda. A cikin sa'o'i nawa ne tankin zai cika? Zaɓuɓɓuka: (A) Awanni 5 (B) Awanni 7 (C) Awanni 8 (D) Sa'o'i 9 (E) Awanni 12 <eng> The question: Two pipes can fill a tank in 20 and 12 hours, while third pipe will make the tank empty in 20 hours. If all three pipes operate simultaneously. In how many hours the tank will be filled ?
Options:
(A) 5 Hours
(B) 7 Hours
(C) 8 Hours
(D) 9 Hours
(E) 12 Hours 