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Sahay Sir > Question Answers > NCERT Class 8 > Maths > Chapter 13 - Direct and Inverse Proportions > Example 3 : 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.

Example 3 : 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.

Example 1 : If x and y are directly proportional and when x = 13 which of the following is not a possible pair of corresponding values of x and y ? y = 39