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A bicyclist is practicing to increase his endurance for a one - hour trip. He has an average speed of 3 0 m / s

A bicyclist is practicing to increase his endurance for a one

-

hour trip. He has an average speed of

30

/

s in the first

30

min. If the cyclist wants an average speed of

40

/

s for the entire trip, by how much does he need to increase his average speed in the last

30

minutes?

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