 As Bob's outward journey had a duration of formula_10, by his clock, it follows by symmetry that Carol's return journey over the same distance at the same speed must also have a duration of formula_10, by her clock, and so when Carol meets Alice, Carol's clock reads formula_33.The "k"-factor for this leg of the journey must be the reciprocal formula_21 (as discussed earlier), so, considering Carol's flash towards Alice, a transmission interval of formula_10 corresponds to a reception interval of formula_8.This means that the final time on Alice's clock, when Carol and Alice meet, is formula_37.