4т 2ц + (3ц40кг - 60кг) * 3

First, we need to simplify the expression inside the parentheses:

3ц40кг = 120кг
120кг - 60кг = 60кг

Now, substitute the simplified expression back into the original equation:

4т 2ц + 60кг * 3
4т 2ц + 180кг

To convert the total weight into tonnes and centners:

180кг = 1т 8ц

Add this back to the original equation:

4т 2ц + 1т 8ц = 5т 0ц

So, the final answer is 5 tonnes and 0 centners.