37. Paul ran a 15-mile race at an average speed of 6 miles per hour. If Adam ran the same race at an average speed of 5 miles per hour, how many minutes longer did Adam take to complete the race than did Paul.

(a) 5
(b) 9
(c) 15
(d) 24
(e) 30

38. If x + 3y = 15, y + 3z = 8, 3x + z = 25, what is the value of x + y + z?

(a) 9
(b) 12
(c) 14
(d) 24
(e) 48

39. If a = 3b and b = 2 – a, what is the value of 4b + 2a?

(a) 3
(b) 4
(c) 5
(d) 6
(e) 7

See the comment for the answer.

Tags: math question, Mathematics Section, SAT Math