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A person walks first at a constant
speed of 5.6 m/s along a straight
line from point A to point B and
then back along the line from B to
A at a constant speed of 1.8 m/s.
What is her average speed over
the entire trip? Enter a number
with two digits behind the
decimal point. Hint: Assume the
distance between A and B is d.
How much distance does the
person cover on her trip? How
long does it take her to cover this
distance?

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