State whether the statements are true (T) or false (F).

Two quantities x and y are said to vary directly with each other it for some rational number k, xy = k.

Fill in the blanks to make the statements true:

If 45 persons can complete a work in 20 days, then the time taken by 75 persons will be ………… hours.

Fill in the blanks to make the statements true:

Devangi travels 50 m distance in 75 steps, then the distance travelled in 375 steps is ………. Km.

State whether the statements are true (T) or false (F).

When the speed is kept fixed, time and distance vary inversely with each other.

State whether the statements are true (T) or false (F).

When the distance is kept fixed, speed and time vary directly with each other.