In a race, you run 3000 -meters east in 21 minutes. What is your velocity in meters/seconds?

Find \( \frac{5}{6}-\left(-\frac{3}{4}\right) \). Write your answer as a mixed number in simplest form.

10. A girl swims 400 m in still water and then returns to the initial point (from where she started) in 20 minutes. Determine the speed of the girl. 11. A man is running at a speed of \( 3 \mathrm{~m} / \mathrm{s} \) and covers some distance in 15 sec . Find the time taken by his pet dog to cover the same distance at a speed of \( 10 \mathrm{~m} / \mathrm{s} \).

Find \( -\frac{7}{8}-2 \frac{1}{6} \). Write your answer as a mixed number in simplest form

\( ( 7 \times 5 ) \quad \bmod 6 \)

c) \( 8+(-18): 3= \)