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2.25 miles

Step-by-step explanation:

rate of mary walking

3/60=1/20

rate of jerry jogs

4/60=1/15

find how long mary walked

2÷1/15=30 minutes

30 mins + 15 mins = 45 mins

45 × 1/20 = 2.25 miles

    Volume of a Sphere = πr³

⇒  πr³  =  36π in³
by comparing the left and right hand side

⇒ r³ = 36

⇒   r = ∛(36 ÷  )
     
      r = 3

Now,
  the surface area of a sphere = 4 πr²
⇒  surface area of a sphere = 4 × (3)² × π
                                             = 36π in²