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Sagot :
It would take Mario 18 minutes longer than his sister
Calculating Time
From the question, we are to determine how much longer it would take Mario to walk 9 miles than his sister
First, we will determine the speed of each one of them
Using the formula,
Speed = Distance/ Time
Mario's speed = 3 miles/ 42 minutes
Mario's speed = 1/14 miles/ minute
and
His sister's speed = 6 miles/ 72 minutes
His sister's speed = 1/12 miles/ minute
Now, we will determine how long it would take each one of them to walk 9 miles
Using the formula,
Time = Distance / Speed
For Mario,
Time = 9 ÷ 1/14
Time = 9 × 14
Time = 126 minutes
For his sister
Time = 9 ÷ 1/12
Time = 9 × 12
Time = 108 minutes
Difference in time = 126 minutes - 108 minutes
Difference in time = 18 minutes
Hence, it would take Mario 18 minutes longer than his sister
Learn more on Calculating Time here: https://brainly.com/question/17146782
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