Fiona left home at 11.15 a.m. and drove towards the province. 3 hours later, her auntie left their home and drove towards the same province at 88 km/h. When the auntie reached the province at 7.15 p.m., Fiona had another 2 km to travel. What was Fiona’s average speed? Express your answer in mixed number.
Time that the Fiona's auntie started driving = 2.15 p.m.
Duration that Fiona's auntie drove from 2.15 p.m. to 7.15 p.m. = 5 h

Distance that Fiona's auntie travelled
= 5 x 88
= 440 km

Distance that Fiona travelled by the time her auntie reached the city
= 440 - 2
= 438 km

Time that Fiona took to travel 438 km = 8 h

Fiona's average speed
= 438 ÷ 8
= 54³₄ km/h

Answer(s): 54³₄ km/h