Elyse left home at 11.20 a.m. and drove towards the countryside. 3 hours later, her grandfather left their home and drove towards the same countryside at 93 km/h. When the grandfather reached the countryside at 7.20 p.m., Elyse had another 5 km to travel. What was Elyse’s average speed? Express your answer in mixed number.
Time that the Elyse's grandfather started driving = 2.20 p.m.
Duration that Elyse's grandfather drove from 2.20 p.m. to 7.20 p.m. = 5 h

Distance that Elyse's grandfather travelled
= 5 x 93
= 465 km

Distance that Elyse travelled by the time her grandfather reached the city
= 465 - 5
= 460 km

Time that Elyse took to travel 460 km = 8 h

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

Answer(s): 57¹₂ km/h