A flat plate has thickness 5cm, thermal conductivity 1 W/m.K, convective heat transfer coefficient on its two flat faces are 10 W/Sq.m.K and 20 W/Sq.m.K. The overall heat transfer coefficient for the plate is:
A. 5
B. 30
C. 6.33
D. 20
Answer: Option A
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what will be the formula used