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Two candles having the same lengths a...

Two candles having the same lengths are such that one burns out completely in 3 hours at a uniform rate and the other in 4 hours. At what time should both the candles be lighted together so that at 4 P.M. the length of one is twice the length of the other? (a) 1: 24 P.M.    (b) 1: 30 P.M.    (c) 1: 36 P.M.    (d) 1: 42 P.M.

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