Jean left home at 11.30 a.m. and drove towards the suburb. 2 hours later, her older brother left their home and drove towards the same suburb at 96 km/h. When the older brother reached the suburb at 5.30 p.m., Jean had another 3 km to travel. What was Jean’s average speed? Express your answer in mixed number.
Time that the Jean's older brother started driving = 1.30 p.m.
Duration that Jean's older brother drove from 1.30 p.m. to 5.30 p.m. = 4 h

Distance that Jean's older brother travelled
= 4 x 96
= 384 km

Distance that Jean travelled by the time her older brother reached the city
= 384 - 3
= 381 km

Time that Jean took to travel 381 km = 6 h

Jean's average speed
= 381 ÷ 6
= 63¹₂ km/h

Answer(s): 63¹₂ km/h