Verona owns a landscaping company, and she is mulching all of the flowerbeds at the houses in a planned retirement community. The figure shows the layout of the neighborhood and the times that Verona started mulching the flowerbeds at two of the houses. According to the architect’s plans for the community, the flowerbed for each house is approximately 0.006 acres in size.
NOTE: There are 34 houses; timings are 8am to 9:20am (for 5 houses) on the pic.
How many minutes will it take Verona to much all of the flowerbeds in the community? I got an answer of 544 mins, but the answer key says 680 is the answer.