Elyse left home at 11.35 a.m. and drove towards the city. 2 hours later, her younger sister left their home and drove towards the same city at 98 km/h. When the younger sister reached the city at 4.35 p.m., Elyse had another 3 km to travel. What was Elyse’s average speed? Express your answer in mixed number.
Time that the Elyse's younger sister started driving = 1.35 p.m.
Duration that Elyse's younger sister drove from 1.35 p.m. to 4.35 p.m. = 3 h

Distance that Elyse's younger sister travelled
= 3 x 98
= 294 km

Distance that Elyse travelled by the time her younger sister reached the city
= 294 - 3
= 291 km

Time that Elyse took to travel 291 km = 5 h

Elyse's average speed
= 291 ÷ 5
= 58¹₅ km/h

Answer(s): 58¹₅ km/h