The tractor drove 1000 m in 8 minutes, and the next 20 minutes it drove 4 km to find the average speed.

To find the value of the average speed of a given tractor, we will use the formula: Vav = (S1 + S2) / (t1 + t2).

Variables: S1 – the first leg of the tractor path (S1 = 1000 m); t1 – the first elapsed time (t1 = 8 min = 480 s); S2 – second leg of the route (S2 = 4 km = 4000 m); t2 – second time (t2 = 20 min = 1200 s).

Calculation: Vav = (1000 + 4000) / (480 + 1200) = 2.976 m / s ≈ 3 m / s.

Answer: This tractor was supposed to move at an average speed of 3 m / s.