The algebraic expression would be x+x+3=37
The answer would be that Michael drove 17 hours and Sarah drove 20 hours.
Work:
x+x+3=37
(combine like-terms)
2x+3=37
(subract 3 from each side of the equation)
2x=34
(divide 2 from each side of the equation)
x=17
17 would be the number of hours that michael drove but since sarah drove 3 hours longer you add 3 so then sarah drove 20 hours.