# Answer on Mechanics | Relativity Question for sai

Question #3308

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

Expert's answer

**Average speed = total distance / total time**

T

_{1}= 80 [km]/40 [kmph] = 2 [h]

T

_{2}= 180 [km] / 60 [kmph] = 3 [h]

Total time = T

_{1}+ T

_{2}= 2 + 3 = 5 [h]

Total distance = 80 + 180 = 260 [km]

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

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