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Which of the following is in direct proportion ?（ ）
A. One side of a cuboid and its volume.
B. Speed of a vehicle and the distance travelled in a fixed time interval.
C. Change in weight and height among individuals.
D. Number of pipes to fill a tank and the time required to fill the same tank.
Speed
00:00
03:11

## QuestionMathsClass 8

Which of the following is in direct proportion ?（ ）
A. One side of a cuboid and its volume.
B. Speed of a vehicle and the distance travelled in a fixed time interval.
C. Change in weight and height among individuals.
D. Number of pipes to fill a tank and the time required to fill the same tank.

B
4.6
4.6

## Solution

We know that , distance $$=$$ speed $$\times$$ time.
For fixed time interval , distance $$\propto$$ speed.
Thus for fixed time interval distance is directly proportional to speed.
Hence option $$(B)$$ is correct.
And remaininge all three option are Inverse proportion .