self Maths Puzzle

A rope and a lighter are given. The complete rope burns in 1hr,but rate of burning is not same. This means it is not necessary that 1/2 of rope burns in 1/2hr. Given the 1 rope & lighter, how would you measure 1/2 hr?

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self Other Question

18:30::36:?
A 54 B 62
C 64 D 66


9 : 22 : : 16 : ?

A 60 B 32
C 140 D 64