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Q.

A cup of coffee cools from 90oC to 80oC in t minutes, when the room temperature is 20oC. The time taken by a similar cup of coffee to cool from 80oC to 60oC at a room temperature same at 20oC is :

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a

513t

b

1013t

c

1310t

d

135t

answer is C.

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Detailed Solution

80−60t′90−80t=80+602−2090+802−20⇒20t′×t10=5065⇒t1=2t×6550=135t

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