How many rides they have for a 3 and 5 year old?

There is Kiddie Land as well as Thomas Town. There are a bunch of flat rides that parents can ride with the children.

And if any are 42 inch tall they can ride with you.

Hi, you can take younger children to "Kiddie Land" there are plenty of rides in that section of the park .Its nice. The new Thomas Train rides , Thomas the Train Play room wigh gift shop and bathrooms inside . theres swing ride, merry go round , planes andblots more to do . They will have fun there .Has bathrooms in that section too. Have fun!.😊.

Depends on height.. 42 and above can ride a few bigger ones.. Google height req for kennywood and it will come up

Depends on how many may or may not be broken and how many workers may or may not show up that day, in addition to whatever closing time park management decides to make up. You know what? Save yourself the trouble and just go to Cedar Point or Walt Disney World instead.