human
Grandma walks 3 miles every day on her favorite walking trail, which includes 2 miles of walking on the beach and 1 mile of walking on the sidewalk. On the sidewalk, Grandma walks at twice the rate of speed that she does on the beach. If 40 minutes of her walk is spent on the beach, how long does it take for her to complete the entire 3-mile walk, in minutes?
assistant
How fast does Grandma walk on the beach? ** On the beach, Grandma walks at a rate of 2 miles per 40 minutes, or 2/40 = 1/20 miles per minute.
How fast does Grandma walk on the sidewalk? ** On the sidewalk, she walks at twice the rate of speed as when she is on the sand, or 2 * 1/20 = 1/10 miles per minute.
How long does it take Grandma to walk 1 mile on the sidewalk? ** To walk 1 mile on the sidewalk, it takes her 1/(1/10) = <<1/(1/10)=10>>10 minutes.
How long does it take Grandma to walk 3 miles? ** Thus, in total, it takes Grandma 40+10 = <<40+10=50>>50 minutes to walk her favorite route.
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