Answer to Question #3308 in Mechanics | Relativity for sai

Question

A bus travels at 40kmph for a distance of 80 km and at 60kmph for a distance of 180km. The average speed is __

Answer 1

Average speed = total distance / total time

T₁ = 80 [km]/40 [kmph] = 2 [h]
T₂ = 180 [km] / 60 [kmph] = 3 [h]
Total time = T₁ + T₂ = 2 + 3 = 5 [h]
Total distance = 80 + 180 = 260 [km]

Average speed = 260 [km] / 5 [h] = 52 [kmph]