Flight Changi Airport departs from Singapore Changi Airport at 10:30 and arrives at Palembang Sultan Mahmud Badaruddin II International Airport at 10:45.
The flighttime is about 1h 15m. The distance travelled ("as the bird flies"): 141 Km. So the average speed is roughly 113 Km.
There is an 1 hour time difference between Singapore and Palembang