Xandra left home at 11.40 a.m. and drove towards the city. 2 hours later, her auntie left their home and drove towards the same city at 88 km/h. When the auntie reached the city at 4.40 p.m., Xandra had another 4 km to travel. What was Xandra’s average speed? Express your answer in mixed number.
Time that the Xandra's auntie started driving = 1.40 p.m.
Duration that Xandra's auntie drove from 1.40 p.m. to 4.40 p.m. = 3 h

Distance that Xandra's auntie travelled
= 3 x 88
= 264 km

Distance that Xandra travelled by the time her auntie reached the city
= 264 - 4
= 260 km

Time that Xandra took to travel 260 km = 5 h

Xandra's average speed
= 260 ÷ 5
= 52 km/h

Answer(s): 52 km/h