If Janice reads x pages every 30 minutes, then she reads 2x pages per hour because there are 2 30-minute periods every hour. Because Janice reads for 4 hours, she reads 4(2x) = 8x pages.

Likewise, if Kim reads y pages every 15 minutes, then she reads 4y pages per hour. Because Kim reads for 5 hours, she reads 5(4y) = 20y pages.

So the answer probably looks something like 8x + 20y.

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