What is the length of the missing side, x?

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Consider circle h with a 3 centimeter radius. if the length of minor arc what is the measure of zrst?

Kyle and elijah are planning a road trip to california. their car travels 3/4 of a mile per min. if they did not stop driving, how many miles could kyle and elijah drove in a whole day? ? 1 day = 24 hours. plzzz write a proportion i will give you 100 points