Victoria left home at 10.40 a.m. and drove towards the seaside resort. 3 hours later, her cousin left their home and drove towards the same seaside resort at 88 km/h. When the cousin reached the seaside resort at 6.40 p.m., Victoria had another 4 km to travel. What was Victoria’s average speed? Express your answer in mixed number.
Time that the Victoria's cousin started driving = 1.40 p.m.
Duration that Victoria's cousin drove from 1.40 p.m. to 6.40 p.m. = 5 h

Distance that Victoria's cousin travelled
= 5 x 88
= 440 km

Distance that Victoria travelled by the time her cousin reached the city
= 440 - 4
= 436 km

Time that Victoria took to travel 436 km = 8 h

Victoria's average speed
= 436 ÷ 8
= 54¹₂ km/h

Answer(s): 54¹₂ km/h