 
 <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. <hau> Mun san cewa lokacin da Anna ke ciyarwa yana tafiya ne na minti 20 kasa da lokacin tafiya na Jenny: a = j - 20. Mun kuma san cewa nisan da mutanen biyu suka yi tafiya daidai ne, saboda haka saurin su sau lokutan tafiyarsu ya zama daidai: 15j = 45a. Sauya lissafi na farko a cikin lissafi na biyu, muna samun 15j = 45 ((j - 20). Ta hanyar ninkawa ta hanyar iyakance muna samun 15j = 45j - 900. Idan muka cire 45j daga bangarorin biyu, za mu samu -30j = -900. Idan muka raba bangarorin biyu da -30 sai mu samu j = 30. Tun da yake Anna ta yi tafiyar minti 20 kafin Jenny, ta yi tafiyar minti 30 - minti 20 = minti 10. Amsar ita ce 10. 