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Question
A person, who can walk down a hill at the rate of $$4\frac{1}{2}$$ km/hr and up the hill at the rate of 3 km/hr. He ascends and comes down to his starting point in 5 hours. How far did he ascend ?
Options:
A .  13.5 km
B .  3 km
C .  15 km
D .  9 km
Answer: Option D

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