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Problem
Problem
A liquid takes 5 minutes to cool from
80
∘
C
80^{\circ}\text{C}
8
0
∘
C
to
50
∘
C
50^{\circ}\text{C}
5
0
∘
C
. How much time will it take to cool from
60
∘
C
60^{\circ}\text{C}
6
0
∘
C
to
30
∘
C
30^{\circ}\text{C}
3
0
∘
C
? The temperature of surroundings is
20
∘
C
20^{\circ}\text{C}
2
0
∘
C
.
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