A tap supplies water at 25oC while another supplies water at 75oC. If a man…

A tap supplies water at 25oC while another supplies water at 75oC. If a man wishes to bathe with water at 40oC, the ratio of the mass of cold water to the mass of hot water required is
  • A.
    1 : 3
  • B.
    15 : 8
  • C.
    7 : 3
  • D.
    3 : 1
Correct Answer: Option C
Explanation

Heat lost = heat gained
mh x c x (75 – 40) = mc x c x (40 – 25)
(frac{m_h}{m_c}) = (frac{35}{15})
= (frac{7}{3})

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