Eva left home at 10.10 a.m. and drove towards the suburb. 3 hours later, her younger sister left their home and drove towards the same suburb at 88 km/h. When the younger sister reached the suburb at 6.10 p.m., Eva had another 6 km to travel. What was Eva’s average speed? Express your answer in mixed number.
Time that the Eva's younger sister started driving = 1.10 p.m.
Duration that Eva's younger sister drove from 1.10 p.m. to 6.10 p.m. = 5 h

Distance that Eva's younger sister travelled
= 5 x 88
= 440 km

Distance that Eva travelled by the time her younger sister reached the city
= 440 - 6
= 434 km

Time that Eva took to travel 434 km = 8 h

Eva's average speed
= 434 ÷ 8
= 54¹₄ km/h

Answer(s): 54¹₄ km/h