Nicole left home at 11.30 a.m. and drove towards the campsite. 2 hours later, her father left their home and drove towards the same campsite at 86 km/h. When the father reached the campsite at 5.30 p.m., Nicole had another 5 km to travel. What was Nicole’s average speed? Express your answer in mixed number.
Time that the Nicole's father started driving = 1.30 p.m.
Duration that Nicole's father drove from 1.30 p.m. to 5.30 p.m. = 4 h

Distance that Nicole's father travelled
= 4 x 86
= 344 km

Distance that Nicole travelled by the time her father reached the city
= 344 - 5
= 339 km

Time that Nicole took to travel 339 km = 6 h

Nicole's average speed
= 339 ÷ 6
= 56¹₂ km/h

Answer(s): 56¹₂ km/h