The steering wheel of a car has a radius of 0.18 m, and the steering wheel of a truck has a radius of 0.30 m. the same force is applied in the same direction to each steering wheel. what is the ratio of the torque produced by this force in the truck to the torque produced in the car?

Torque is equal to force applied multiplied by the distance from a fixed point. That is,
                                T = force x distance
For the given wheels, the force is equal while the ratio of the distance is 0.3/0.18. This same ratio should be equal to the ratio of the torque. Thus, the answer to this item is equal to 5/3.