Emma left home at 11.50 a.m. and drove towards the province. 2 hours later, her uncle left their home and drove towards the same province at 89 km/h. When the uncle reached the province at 4.50 p.m., Emma had another 6 km to travel. What was Emma’s average speed? Express your answer in mixed number.
Time that the Emma's uncle started driving = 1.50 p.m.
Duration that Emma's uncle drove from 1.50 p.m. to 4.50 p.m. = 3 h

Distance that Emma's uncle travelled
= 3 x 89
= 267 km

Distance that Emma travelled by the time her uncle reached the city
= 267 - 6
= 261 km

Time that Emma took to travel 261 km = 5 h

Emma's average speed
= 261 ÷ 5
= 52¹₅ km/h

Answer(s): 52¹₅ km/h