Xylia left home at 11.20 a.m. and drove towards the province. 2 hours later, her grandfather left their home and drove towards the same province at 92 km/h. When the grandfather reached the province at 5.20 p.m., Xylia had another 2 km to travel. What was Xylia’s average speed? Express your answer in mixed number.
Time that the Xylia's grandfather started driving = 1.20 p.m.
Duration that Xylia's grandfather drove from 1.20 p.m. to 5.20 p.m. = 4 h

Distance that Xylia's grandfather travelled
= 4 x 92
= 368 km

Distance that Xylia travelled by the time her grandfather reached the city
= 368 - 2
= 366 km

Time that Xylia took to travel 366 km = 6 h

Xylia's average speed
= 366 ÷ 6
= 61 km/h

Answer(s): 61 km/h