5. A particle moved from point A to point B, travelling some distance with speed 60 kmh-1. Then it
moves back from B to A with speed 40 km/h. The average speed for the entire journey=
kmh-1 5
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Answer:
Let distance from A to B=x km= distance from B to A.
Time taken by train from A to B =
60
x
hr
Time taken by train from B to A =
80
x
hr
Total time taken by train =
60
x
+
80
x
=
240
7x
hr
average speed=
total time
total distance
=
240
7x
2x
=
7
480
km h
−1
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