A practical problem states that a car travels 60 km/h and a truck travels 40 km/h. If they start from the same point and travel in opposite directions, how far apart will they be after 2 hours?
A practical problem states that a total of 50 apples and oranges are in a basket. If there are 30 apples, how many oranges are there? Formulate the equation and solve for the number of oranges.