Answer: 6.8?
Explanation:
If there are 5 cars and each are about 3000 lb. each, what we have to do is multiply. That will get us an answer of 15000. And if we know that 2000lb is one ton, then we can estimate that it'll be around 6 - 7 tons. I'm not sure if the answer is right, please correct me if I am wrong.