Question

The front and rear wheels of a tractor have different diameters in the proportion of 1:2. What will be the speed of the front wheel, if the rear wheel moves at 40 km/hr on the road?

• A. 80 km/hour
• B. 40 km/hour
• C. 60 km/hour
• D. 120 km/hour

Hint:

Different wheel sizes change rotational speed, not the actual travelling speed of the vehicle.

Answer 1

The Correct Option is B

Step 1: Understanding the wheel relationship.
Both wheels are fixed to the same tractor, so they travel the same linear distance per unit time. This means their *linear speeds* are identical, regardless of diameter.

Step 2: Clarifying the confusion.
Different diameters affect rotational speed (rpm), not linear speed. - Larger wheel → fewer rotations but same linear speed - Smaller wheel → more rotations but same linear speed Thus, although the front wheel rotates faster, its speed on the road (km/hr) remains the same.

Step 3: Conclusion.
Since both wheels move with the tractor, the front wheel also moves at 40 km/hr. Hence, the correct answer is (B).