Julie left home at 10.40 a.m. and drove towards the seaside resort. 3 hours later, her older brother left their home and drove towards the same seaside resort at 94 km/h. When the older brother reached the seaside resort at 5.40 p.m., Julie had another 5 km to travel. What was Julie’s average speed? Express your answer in mixed number.
Time that the Julie's older brother started driving = 1.40 p.m.
Duration that Julie's older brother drove from 1.40 p.m. to 5.40 p.m. = 4 h

Distance that Julie's older brother travelled
= 4 x 94
= 376 km

Distance that Julie travelled by the time her older brother reached the city
= 376 - 5
= 371 km

Time that Julie took to travel 371 km = 7 h

Julie's average speed
= 371 ÷ 7
= 53 km/h

Answer(s): 53 km/h