Fiona left home at 11.20 a.m. and drove towards the city. 2 hours later, her father left their home and drove towards the same city at 97 km/h. When the father reached the city at 4.20 p.m., Fiona had another 2 km to travel. What was Fiona’s average speed? Express your answer in mixed number.
Time that the Fiona's father started driving = 1.20 p.m.
Duration that Fiona's father drove from 1.20 p.m. to 4.20 p.m. = 3 h

Distance that Fiona's father travelled
= 3 x 97
= 291 km

Distance that Fiona travelled by the time her father reached the city
= 291 - 2
= 289 km

Time that Fiona took to travel 289 km = 5 h

Fiona's average speed
= 289 ÷ 5
= 57⁴₅ km/h

Answer(s): 57⁴₅ km/h