A liquid takes 30s to cool from 95^(0)C to 90^(0)C and 70s to cool from 55^(0)C. If time taken by the liquid to cool from 50^(0)C to 45^(0)C is 21k (in seconds), then find the value of k.

A liquid takes 30s to cool from 95^(0)C to 90^(0)C and 70s to cool fro

1.	A liquid takes 30s to cool from 95^(0)C to 90^(0)C and 70s to cool from 55^(0)C. If time taken by the liquid to cool from 50^(0)C to 45^(0)C is 21k (in seconds), then find the value of k.
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