Several children riding on a merry-go-round in cool weather .
There is a very good chance that the group of children rode on the merry-go-round for almost an hour .
It is impossible that the group of children rode on the merry-go-round for almost an hour .
There is a very good chance that the group of children rode on the merry-go-round for almost an hour .
The group of children rode on the merry-go-round for almost an hour .