Heat and Mass Transfer
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Directly proportional to the surface area
Both (A) and (B)
Either (A) or (B)
Directly proportional to the difference of temperatures between the two bodies

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Heat and Mass Transfer
In counter flow heat exchangers

Both the fluids at exit are in their hottest state
One fluid is in hottest state and other in coldest state at inlet
Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state
Both the fluids at inlet are in their hottest state

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