Hellp please

Find the average speed of a rabbit that runs a distance of 22 m in a time of 1.8 s .

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?