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Question
A boy goes three equal distance, each of length x km, with speed of y km/hr, $$\frac{3\text{y}}{5}$$ km/hr and $$\frac{2\text{y}}{5}$$ respectively. If the total time taken is 1 hour, then x : y is equal to :
Options:
A .  6 : 13
B .  6 : 23
C .  6 : 31
D .  6 : 37
Answer: Option C

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