2 7. A train takes 2 h to reach station B from station A, and then 3 h to return from station B to station A. The distance between the two stations is 200 km. Find : (i) the average speed, (ii) the average velocity of the Ans. (1) 80 km h-', (ii) zero, train
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Total distance D=200+200=400 km
Average speed ∣V
avg
∣=
Total time
Total distance
∴ ∣V
avg
∣=
2+3
400
=80 km/h
Displacement S=0
Average velocity V
avg
=
Total time
Total displacement
∴ V
avg
=
2+3
0
=0 km/h
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