Nicole left home at 11.25 a.m. and drove towards the suburb. 3 hours later, her father left their home and drove towards the same suburb at 99 km/h. When the father reached the suburb at 7.25 p.m., Nicole had another 3 km to travel. What was Nicole’s average speed? Express your answer in mixed number.
Time that the Nicole's father started driving = 2.25 p.m.
Duration that Nicole's father drove from 2.25 p.m. to 7.25 p.m. = 5 h

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

Distance that Nicole travelled by the time her father reached the city
= 495 - 3
= 492 km

Time that Nicole took to travel 492 km = 8 h

Nicole's average speed
= 492 ÷ 8
= 61¹₂ km/h

Answer(s): 61¹₂ km/h