Answer :

In situation (b) water will get heated in a shorter span of time where Sonu kept water beaker in the outer most part of the flame. This is because the outermost part of the flame is the hottest zone of a flame as in this zone complete combustion takes place due to good supply of oxygen. This zone is blue in colour.

Whereas in the yellow part of a candle flame incomplete combustion takes place due to which it is moderately hot. That’s why the water beaker kept in outer most part of the flame will get heated first.

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