Raeann left home at 11.20 a.m. and drove towards the town. 2 hours later, her older brother left their home and drove towards the same town at 82 km/h. When the older brother reached the town at 6.20 p.m., Raeann had another 4 km to travel. What was Raeann’s average speed? Express your answer in mixed number.
Time that the Raeann's older brother started driving = 1.20 p.m.
Duration that Raeann's older brother drove from 1.20 p.m. to 6.20 p.m. = 5 h

Distance that Raeann's older brother travelled
= 5 x 82
= 410 km

Distance that Raeann travelled by the time her older brother reached the city
= 410 - 4
= 406 km

Time that Raeann took to travel 406 km = 7 h

Raeann's average speed
= 406 ÷ 7
= 58 km/h

Answer(s): 58 km/h