drive.

The two 'Drive' learning objects present the user with proportional problems involving time distance and speed.

They are given one ratio (distance and time) for a car, and asked to find the missing part of a second ratio.

The solution entered by the user is shown on a graph, providing visual feedback either that the answer is correct or, if incorrect, whether it is too large or too small.

"Drive: easy problems" provides problems where the missing ratio can be found by multiplying or dividing by a whole number.
"Drive: hard problems" provides problems where finding the missing ratio requires either two operations or multiplying/dividing by a fraction.