Xuan left home at 11.10 a.m. and drove towards the campsite. 2 hours later, her uncle left their home and drove towards the same campsite at 93 km/h. When the uncle reached the campsite at 4.10 p.m., Xuan had another 6 km to travel. What was Xuan’s average speed? Express your answer in mixed number.
Time that the Xuan's uncle started driving = 1.10 p.m.
Duration that Xuan's uncle drove from 1.10 p.m. to 4.10 p.m. = 3 h

Distance that Xuan's uncle travelled
= 3 x 93
= 279 km

Distance that Xuan travelled by the time her uncle reached the city
= 279 - 6
= 273 km

Time that Xuan took to travel 273 km = 5 h

Xuan's average speed
= 273 ÷ 5
= 54³₅ km/h

Answer(s): 54³₅ km/h