please explain steps

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 15 and 30 minutes late. (b) It is 10 AM. There is a 30% probability the friend will arrive within how many minutes? \"3 Density E ,0 ,9 0 o 10 20 sex Tlme (min) (a) The probability that the friend is between 15 and 30 minutes late is 0.500'. (Type an integer or a decimal. Round to three decimal places as needed.) (b) There is a 30% probability the friend will arrive within minutes. (Type a whole number.)