 <translate> We know that the time that Anna spends traveling is 20 minutes less than Jenny's travel time: a = j - 20. We also know that the distance both people travel is equal, so their speeds times their travel times must be equal: 15j = 45a. Substituting the first equation into the second equation, we get 15j = 45(j - 20). Multiplying through the parentheses we get 15 j = 45j - 900. Subtracting 45 j from both sides, we get - 30j =  - 900. Dividing both sides by - 30, we get j = 30. Since Anna travels 20 minutes less than Jenny, she traveled 30 minutes - 20 minutes = 10 minutes. So, the answer is 10. <yor> A mọ̀ pé àkókò tí Anna fi ń rìnrìn àjò kéré ní ogún ìṣẹ́jú sí àkókò tí Jenny fi rìnrìn àjò: a = j - 20. A tún mọ̀ wípé ìrìn tí àwọn ènìyàn méjèèjì rìn bára mu, nítorí náà, iyara wọn ní láti dọ́gba pẹ̀lú àkókò ìrìn wọn: 15j = 45a. Tí a bá fi àfikún àkọ́kọ́ sí àfikún kejì, a ó rí 15j = 45(j - 20). Tá a bá fi àwọn àlàfo yìí kún wọn, a ó rí 15j = 45j - 900. Tá a bá yọ 45j kúrò ní ìhà méjèèjì, a ó rí - 30j = - 900. Tá a bá pín ìlà méjèèjì sí - 30, a máa rí i pé j=30. Níwọ̀n bó ti jẹ́ pé ogún ìṣẹ́jú ni ìrìn-àjò tí Anna rìn jìnnà sí ti Jenny, ó rin ìrìn-àjò ọgbọ̀n ìṣẹ́jú - ogún ìṣẹ́jú = ìṣẹ́jú mẹ́wàá. Nítorí náà, ìdáhùn náà ni 10. 