Xylia left home at 11.50 a.m. and drove towards the suburb. 2 hours later, her auntie left their home and drove towards the same suburb at 92 km/h. When the auntie reached the suburb at 6.50 p.m., Xylia had another 5 km to travel. What was Xylia’s average speed? Express your answer in mixed number.
Time that the Xylia's auntie started driving = 1.50 p.m.
Duration that Xylia's auntie drove from 1.50 p.m. to 6.50 p.m. = 5 h

Distance that Xylia's auntie travelled
= 5 x 92
= 460 km

Distance that Xylia travelled by the time her auntie reached the city
= 460 - 5
= 455 km

Time that Xylia took to travel 455 km = 7 h

Xylia's average speed
= 455 ÷ 7
= 65 km/h

Answer(s): 65 km/h