To find the ratio of the constant of proportionality, we can divide the number of pages by the time it takes to read them. Let's calculate the ratio for each given time-page combination:
For 1/2 hour to read 15 pages: 15 pages / 30 minutes = 1/2 page per minute
For 1 hour to read 30 pages: 30 pages / 60 minutes = 1/2 page per minute
For 1 1/2 hours to read 45 pages: 45 pages / 90 minutes = 1/2 page per minute
For 2 hours to read 60 pages: 60 pages / 120 minutes = 1/2 page per minute
In all cases, the ratio of pages to time is 1/2 page per minute. Therefore, the ratio of the constant of proportionality is A. 1:30.
Time. Pages
1/2. 15
1. 30
1 1/2. 45
2. 60
Ruth can read 15 pages in 30 minutes. She decides to create a table to keep track of her progress. From the data provided at what ratio is the constant of proportionality?
A.1:30
B. 15:1/2
C. 1 1/2:30
D. 2:60
1 answer