Olivia left home at 10.10 a.m. and drove towards the province. 3 hours later, her uncle left their home and drove towards the same province at 98 km/h. When the uncle reached the province at 6.10 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 = 1.10 p.m.
Duration that Olivia's uncle drove from 1.10 p.m. to 6.10 p.m. = 5 h

Distance that Olivia's uncle travelled
= 5 x 98
= 490 km

Distance that Olivia travelled by the time her uncle reached the city
= 490 - 2
= 488 km

Time that Olivia took to travel 488 km = 8 h

Olivia's average speed
= 488 ÷ 8
= 61 km/h

Answer(s): 61 km/h