Me i don't understand this question

To find their common denominator, you must first find the lowest common multilple for 8 and 3.
8 × 3 = 24

24 is the lowest common multilple. Now you just have to make 24 the common denominator by multiplying the fractions like so:


Now they both contain the same denominator, we can compare the equasions easier that way:

If we use the original fractions, the answer is:

605 pounds in 3.5 hours = 605/3.5 = 172.86 lbs per hour
2100 pounds in 10 hours = 2100/10 = 210 lbs per hour

1st point (3.5,605)
2nd point (10, 2100)

slope = (2100 - 605)/10-3.5 = 1495/6.5 = 230

y = mx + b
y = 230x + b

605 = 230(3.5) + b
605 = 805 + b
605 = 805 - 200

y = 230x - 200
y = 230(12) - 200
y = 2,760 - 200
y = 2,560

2,560 lbs of strawberries in 12 hours.