A sack of rice weighs $1 \mathrm{quintal}$. How much would $4$, such sacks weigh in kilograms? (Answer in $\mathrm{kg}$.)

Multiply $7 \mathrm{kg} 8 \mathrm{g}$ by $12$.

Multiply $8 \mathrm{kg} 250 \mathrm{g}$ by $9$.

Multiply $14 \mathrm{kg} 500 \mathrm{g}$ by $6$. If the final answer is $W \mathrm{kg}$, write the value of $W$ in the answer box.

If one gold bangle is made from $12$ grams $250$ milligrams of gold, how much gold will be needed to make $8$ such bangles$?$ $\left(1000 \mathrm{mg}=1 \mathrm{g}\right)$

If a car travels $60 \mathrm{km}$ in an hour, how far will it travel in -

$2$ hours $?$

$15$ minutes $?$

Half an hour $?$

Three and a half hours $?$

Multiply $32 \mathrm{kg} 70 \mathrm{g}$ by $3$.