Answer: Masha needs 40 more minutes to complete the path.
Step-by-step explanation:
So if Dina is cycling speed is 10km per hour that means it will take Dina 2 hours to completed the the path.
Here; Â [tex]\frac{10km}{1h}[/tex] = [tex]\frac{20km}{x }[/tex] Â
      10x = 20
    x= 2 Â
But since Masha still have 4 more km to go  you will add 20 + 4 =24
[tex]\frac{10}{1}[/tex] = [tex]\frac{24}{x}[/tex]
10x= 24
x= 2.4