Anna left home at 11.25 a.m. and drove towards the seaside resort. 2 hours later, her mother left their home and drove towards the same seaside resort at 98 km/h. When the mother reached the seaside resort at 4.25 p.m., Anna had another 6 km to travel. What was Anna’s average speed? Express your answer in mixed number.
Time that the Anna's mother started driving = 1.25 p.m.
Duration that Anna's mother drove from 1.25 p.m. to 4.25 p.m. = 3 h

Distance that Anna's mother travelled
= 3 x 98
= 294 km

Distance that Anna travelled by the time her mother reached the city
= 294 - 6
= 288 km

Time that Anna took to travel 288 km = 5 h

Anna's average speed
= 288 ÷ 5
= 57³₅ km/h

Answer(s): 57³₅ km/h