Kylie left home at 11.40 a.m. and drove towards the campsite. 2 hours later, her younger sister left their home and drove towards the same campsite at 96 km/h. When the younger sister reached the campsite at 4.40 p.m., Kylie had another 6 km to travel. What was Kylie’s average speed? Express your answer in mixed number.
Time that the Kylie's younger sister started driving = 1.40 p.m.
Duration that Kylie's younger sister drove from 1.40 p.m. to 4.40 p.m. = 3 h

Distance that Kylie's younger sister travelled
= 3 x 96
= 288 km

Distance that Kylie travelled by the time her younger sister reached the city
= 288 - 6
= 282 km

Time that Kylie took to travel 282 km = 5 h

Kylie's average speed
= 282 ÷ 5
= 56²₅ km/h

Answer(s): 56²₅ km/h