Khammam,Dec.15: One person was killed on the spot and five others were injured when a speeding RTC bus hit a auto-rickshaw at Kollugudem of Badhrachalam mandal on Tuesday.According to the police, the bus which was proceding from Chattisgarh hit the ill-fated autorickshaw, which was on its way to Badhrachalam.P.Sriramulu, 41,of Chellam Palem died on the spot, while one of the injured, Shireesha of Gannavaram was stated be in a critical condition.All the injured were shifted to a hospital at Badhrachalam. The police registered a case.