Elyse left home at 10.40 a.m. and drove towards the town. 3 hours later, her cousin left their home and drove towards the same town at 89 km/h. When the cousin reached the town at 6.40 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 cousin started driving = 1.40 p.m.
Duration that Elyse's cousin drove from 1.40 p.m. to 6.40 p.m. = 5 h

Distance that Elyse's cousin travelled
= 5 x 89
= 445 km

Distance that Elyse travelled by the time her cousin reached the city
= 445 - 5
= 440 km

Time that Elyse took to travel 440 km = 8 h

Elyse's average speed
= 440 ÷ 8
= 55 km/h

Answer(s): 55 km/h