Anna left home at 11.20 a.m. and drove towards the seaside resort. 3 hours later, her father left their home and drove towards the same seaside resort at 99 km/h. When the father reached the seaside resort at 7.20 p.m., Anna had another 5 km to travel. What was Anna’s average speed? Express your answer in mixed number.
Time that the Anna's father started driving = 2.20 p.m.
Duration that Anna's father drove from 2.20 p.m. to 7.20 p.m. = 5 h

Distance that Anna's father travelled
= 5 x 99
= 495 km

Distance that Anna travelled by the time her father reached the city
= 495 - 5
= 490 km

Time that Anna took to travel 490 km = 8 h

Anna's average speed
= 490 ÷ 8
= 61¹₄ km/h

Answer(s): 61¹₄ km/h