Hot water cools from 60 
to 50 
in the first 10 minutes and to 42 
in the next 10 minutes. The temperature of the surrounding
A
5 
B
10 
C
15 
D
20 
Text Solution
Verified by ExpertsThe correct answer is:
B
For first condition 
⇒ ⇒ 1 = K [55 – θ θ ] ……(i)
For second condition 
⇒ ⇒ 0.8 = K (46 – θ θ ) …..(ii)
From (i) and (ii) we get θ θ = 10 
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