Elyse left home at 11.10 a.m. and drove towards the city. 2 hours later, her grandmother left their home and drove towards the same city at 99 km/h. When the grandmother reached the city at 4.10 p.m., Elyse had another 2 km to travel. What was Elyse’s average speed? Express your answer in mixed number.
Time that the Elyse's grandmother started driving = 1.10 p.m.
Duration that Elyse's grandmother drove from 1.10 p.m. to 4.10 p.m. = 3 h

Distance that Elyse's grandmother travelled
= 3 x 99
= 297 km

Distance that Elyse travelled by the time her grandmother reached the city
= 297 - 2
= 295 km

Time that Elyse took to travel 295 km = 5 h

Elyse's average speed
= 295 ÷ 5
= 59 km/h

Answer(s): 59 km/h