A quantity of water at 20ºC is mixed with another quantity of water at 70ºC. The final steady temperature of the mixture is 40oC. Determine the ratio of the mass of the cold water to that of the hot water?

A. 7:2
B. 3:2
C. 2:5
D. 1:2

Correct Answer: Option B

B. 3:2

Explanation

Q = MCθ

M = QCθ

Q/20C : Q/30C

= 3:2

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