HELP PLEASE!!! Mary and Dan started running at the same time. After 20min behind them with the speed of 18km/h Alex started running. Calculate, after how many minutes Alex reached Mary, if we know that he reached Dan after 30min, and the speed ratio between Mary and Dan was 7 : 6 !

Which of the following situations represents a linear relationship? a. theresa increases the distance she runs by 0.1 miles every week. b. the volume of a box depends on the length of box. c. the amount of money in a bank account increases by 1 percent each year. d. the population of a town doubles every 5 years.

Asap 25 pts + brainliest to right/best answer

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.