A company payroll is prepared by two computers in 13 min. Working alone, the faster of the two computers can prepare the payroll in 20 min. How much time does the slower computer alone require to prepare the payroll?

Teams of 4 are competing in a 1/4 mile relay race. each runner must run the same exact distance. what is the distance each teammate runs?

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.

Barrett is comparing the membership fees for two museums.the art museum charges a one-time fee of $8.25 plus $2.25 per month. the science museum charges a one-time fee of $10.75 plus $3.50 per month. how much does barrett save by joining the art museum instead of the science museum?