Olivia left home at 11.30 a.m. and drove towards the campsite. 2 hours later, her uncle left their home and drove towards the same campsite at 95 km/h. When the uncle reached the campsite at 4.30 p.m., Olivia had another 2 km to travel. What was Olivia’s average speed? Express your answer in mixed number.
Time that the Olivia's uncle started driving = 1.30 p.m.
Duration that Olivia's uncle drove from 1.30 p.m. to 4.30 p.m. = 3 h

Distance that Olivia's uncle travelled
= 3 x 95
= 285 km

Distance that Olivia travelled by the time her uncle reached the city
= 285 - 2
= 283 km

Time that Olivia took to travel 283 km = 5 h

Olivia's average speed
= 283 ÷ 5
= 56³₅ km/h

Answer(s): 56³₅ km/h