Certain quantity of water cools from 70 o C to 60 o C in the first 5 minutes and to 54 o C in the next 5…

Certain quantity of water cools from 70 oC to 60 oC in the first 5 minutes and to 54 oC in the next 5 minutes. The temperature of the surroundings is:
  1. 45 oC
  2. 20 oC
  3. 42 oC
  4. 10 oC

Solution

60-705=-K65-T
54-605-K57-T
-10-6=65-T57-T
285-5T=195-3T
90=2T
T=45o .

Asked in: NEET 2014

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