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     EduGorilla 
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    A thin candle, 13 cm long, burns at a rate of 4 cm in  hours and a thick candle, 7 cm long, burns at a rate of 2 cm in 3 hours. Both are lighted simultaneously. The time interval after which both will be of the same length is

    Options :-

    1. 1 hour
    2. 2 hours
    3. 3 hours
    4. 4 hours
    5. 6 hours
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