A car moves from X to Y with a uniform speed 8m/s and returns to X with a uniform speed 10m/s. Calculate the average speed for this round trip.
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Answer:
Average speed is always given by
Total time
Total distance
Let's assume that distance between X and Y is d
So, time taken to go from X to Y will be
v
u
d
And time taken to go from Y to X will be
v
d
d
So, average speed will be
v
u
d
+
v
d
d
2d
=
v
d
+v
u
2v
d
v
u
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