Cash Flow from Investing Activities:
\[
\text{- Purchase of Machinery} = -Rs 1,50,000
\text{+ Sale of Land} = +Rs 80,000
\text{- Purchase of Investments} = -Rs 50,000
\text{+ Interest Received} = +Rs 8,000
\]
\[
\text{Net Cash Flow} = -1,50,000 + 80,000 - 50,000 + 8,000 = -Rs 1,12,000
\]
Final Answer:
\[
\boxed{\text{Cash used in Investing Activities = Rs 1,12,000}}
\]