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Plz I need help on this problem

 

Carissa the chessplayer is a very, very slow walker. In fact, she walks at 100 meters per hour when walking uphill, 120 meters per hour when walking across flat ground, and 180 meters per hour when walking downhill. One day, Carissa walks across Boston from a café to a boba shop, and then takes the same route in reverse to return to the café. What was Carissa's average speed during the entire round trip?

 
 Jan 23, 2023
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Carissa's average speed is 140 meters per hour.

 
 Jan 23, 2023

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