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Question: Warning, solutions may have been lost

Question:Warning, solutions may have been lost

s093412 10 Maple 16
April 09 2013
2

Hi when i'm trying to solve, i get the following warning: Warning, solutions may have been lost.

 

The equations i'm trying to solve are the following:

 

> P := 21000;

> v := 10/(60*1000);

> r := 983;

> Cp := 4181;

> Tl := 40;

> K1 := 124.27;

> K2 := 102.03;

> K3 := 7.23;

> K4 := 2.947;


> eqn1 := P = v*Cp*r*(Tf-Tr);

> eqn2 := H = -v*Cp*r*ln(1-(Tf-Tr)/(Tf-Tl));   

> eqn3 := H = K1+K2*ln(Tf-Tl)+(K3+K4*ln(Tf-Tl))*Tl;


> solve({eqn1, eqn2, eqn3}, {H, Tf, Tr});

Warning, solutions may have been lost

 

What am i doing wrong?
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