URGENT PLEASE HELP ME From the two berths of the river, two motorboats sailed towards each other at the same speed. After 3 hours they met. The boat, which was running downstream, traveled 18km more than the other boat. Calculate the rivers current speed!

Also help me, how can i calculate text problems like these in general? (linear equations)​

Simplify the expression 10/11(22z) + (a+5) -1

Ineed to know the answer to this algebra question.

Aprofessional hockey team has noticed that, over the past several seasons, as the number of wins increases, the total number of hot dogs sold at the concession stands increases. the hockey team concludes that winning makes people crave hot dogs. what is wrong with the hockey team's conclusion? a) it does not take into account the attendance during each season. b) it does not take into account the number of hamburgers sold during each season. c) it does not take into account the number of concession stands in the hockey arena. d) it does not take into account the number of seasons the hockey team has been in existence.