Lucy left home at 11.25 a.m. and drove towards the town. 2 hours later, her older brother left their home and drove towards the same town at 96 km/h. When the older brother reached the town at 4.25 p.m., Lucy had another 6 km to travel. What was Lucy’s average speed? Express your answer in mixed number.
Time that the Lucy's older brother started driving = 1.25 p.m.
Duration that Lucy's older brother drove from 1.25 p.m. to 4.25 p.m. = 3 h

Distance that Lucy's older brother travelled
= 3 x 96
= 288 km

Distance that Lucy travelled by the time her older brother reached the city
= 288 - 6
= 282 km

Time that Lucy took to travel 282 km = 5 h

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

Answer(s): 56²₅ km/h