Predicting changes in centripetal acceleration

A bicycle racer rides around a circular track of radius $R$R. The racer speeds around its first lap at linear speed $v_i$v, start subscript, i, end subscript. Later, their speed decreases to $\dfrac{1}{3}v_i$start fraction, 1, divided by, 3, end fraction, v, start subscript, i, end subscript.