Help with the following and how to solve it pls and thank you

The graph to the right is the uniform probability density function for a friend who is x minutes late. (a) Find the probability that the friend is between 10 and 20 minutes late. (b) It is 10 AM. There is a 30% probability the friend will arrive within how many minutes? (a) The probability that the friend is between 10 and 20 minutes late is I]. (Type an integer or a decimal. Round to three decimal places as needed.) 1/3 9,9 Deneity o 010 20 sex Time (min)