I don't understand how I'm supposed to get the ER on the market without the Risk Free Rate, or how to get the Risk Free Rate without the ER on the market. Please help

Suppose you observe the following situation: a. Assume these securities are correctly priced. Based on the CAPM, what is the expected return on the market? (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) b. What is the risk-free rate? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.)