Lynn left home at 10.55 a.m. and drove towards the seaside resort. 3 hours later, her mother left their home and drove towards the same seaside resort at 96 km/h. When the mother reached the seaside resort at 5.55 p.m., Lynn had another 6 km to travel. What was Lynn’s average speed? Express your answer in mixed number.
Time that the Lynn's mother started driving = 1.55 p.m.
Duration that Lynn's mother drove from 1.55 p.m. to 5.55 p.m. = 4 h

Distance that Lynn's mother travelled
= 4 x 96
= 384 km

Distance that Lynn travelled by the time her mother reached the city
= 384 - 6
= 378 km

Time that Lynn took to travel 378 km = 7 h

Lynn's average speed
= 378 ÷ 7
= 54 km/h

Answer(s): 54 km/h