I need explanation in detail, Thanks in advance

For zero-coupon bond inputs P(0,1)=0.95 and P(0,2)=0.82, and Ho-Lee parameters =0.4 and =0.90, use the Ho-Lee model to calculate the return R(1,1) For zero-coupon bond inputs P(0,1)=0.95 and P(0,2)=0.82, and Ho-Lee parameters =0.4 and =0.90, use the Ho-Lee model to calculate the return R(1,1)