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Q 2423501441.     candles of the same height are lighted at the same time. The first is to be consumed in 5 hours and seconds in 4 hours.
Assuming that they burn at constant rates, in how many hours their height will be in ratio 3 : 2 ?
RRB-CLERK 2016 Mains 2001
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)