"Two candles having the same lengths are such that one burns out completely in 3 hours at a uniform
Channel: Doubtnut
Date: 2020-04-05

"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."