Jaslyn left home at 10.15 a.m. and drove towards the seaside resort. 3 hours later, her grandmother left their home and drove towards the same seaside resort at 93 km/h. When the grandmother reached the seaside resort at 6.15 p.m., Jaslyn had another 5 km to travel. What was Jaslyn’s average speed? Express your answer in mixed number.
Time that the Jaslyn's grandmother started driving = 1.15 p.m.
Duration that Jaslyn's grandmother drove from 1.15 p.m. to 6.15 p.m. = 5 h

Distance that Jaslyn's grandmother travelled
= 5 x 93
= 465 km

Distance that Jaslyn travelled by the time her grandmother reached the city
= 465 - 5
= 460 km

Time that Jaslyn took to travel 460 km = 8 h

Jaslyn's average speed
= 460 ÷ 8
= 57¹₂ km/h

Answer(s): 57¹₂ km/h