The field distance is equal to the distance on the map divided by the scale, so 2.5 divided by 1: 60000000 is equal to/kloc-0 15000000cm and equal to 1500 km.

The departure time is 8:30, the arrival time is 10:00, and the interval time is 1:30, that is, 1.5 hours. According to: speed equals distance divided by time, so1500km divided by 1.5 equals1000km.

The plane flies 1000 km per hour.

I hope it's correct.