Mathematics for IGCSE & O level - Proportion (Section 3 - No. 20)
A car travels a certain distance at a constant speed. If the time taken is doubled, what happens to the speed (assuming distance remains constant)?
The speed doubles.
The speed halves.
The speed remains the same.
The speed is multiplied by four.
คำอธิบาย
Distance = Speed * Time. If time doubles, speed halves because distance is constant, so speed must decrease by the same factor to keep the distance constant.