10.2°/h
Kampala is located at 0.3476° N, 32.5825° E
Singapore is located at 1.3521° N, 103.8198° E
Given that they're within a degree of latitude of each other, that difference will be ignored. However, they're separated by 180.8198° - 32.5825° = 71.2373° of longitude. So dividing by 7, gives
71.2373° / 7.0 h = 10.2°/h