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A graph has been plotted between time el...

A graph has been plotted between time elapsed and the change in the temperature of water and milk on heating. The graph corresponding to water is represented by `3x-4y+72=0` and that corresponding to milk is represented by `4x-3y+36=0`, where `x` is in minutes and y is in `.^(@)C` . After how long, the temperature of the milk will be equal to the temperature of the water ?

A

`(36)/(7)s`

B

`(54)/(7)s`

C

`(72)/(7)s`

D

`(90)/(7)s`

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