8th grade math
posted by rodney .
Carlos and maria drove a total of 258 miles in 5 hours. Carlos drove the first part of the trip and averaged 53 miles per hr maria drove the remainder of the trip and averaged 51 miles per hr for how many hrs did maria drive

Let X be the hours Maria drove. 5X hours were then driven by Carlos.
53 X + 51(5X) = 258 miles covered
53X  51X = 2X = 258  255 = 3
X = 3/2 hour
Carlos did most of the driving. 
x=3\2

Toni rows a boat 4.5 km/h upstream and then turns around and rows 5.5 km/h back downstream to her starting
point. If her total rowing time is 48 min, for how long does she row downstream? Express your answer to the
nearest minute.