Maharashtra Board Solutions for Exercise 4: Practice Set 7.3

Which of the following statements are of inverse variation?

If $15$ workers can build a wall in $48$ hours, how many workers will be required to do the same work in $30$ hours ?

$120$ bags of half litre milk can be filled by a machine within $3$ minutes, if it takes $k$ minutes to fill such $1800$ bags then find $k$.

A car with speed $60 \mathrm{km}/\mathrm{h}$ takes$8$ hours to travel some distance. If the increase in the speed if the same distance is to be covered in $7\frac{1}{2}$hours is $k \mathrm{km}/\mathrm{h}$, find the value of $k$.