I have no idea where to begin for this problem in order to get a riskless rate of 8.7% and 11.7% for the expected return on the market. Any ideas where I can start. Thank you in advance!

Wal-Mart Company stock has beta of 1.1 and its expected return is 12%, whereas Dell Company stock has beta of 1.2 and its expected return is 12.3%. Find the riskless rate and the expected return on the market.

(8.7%, 11.7%)