Raeann left home at 11.55 a.m. and drove towards the city. 3 hours later, her cousin left their home and drove towards the same city at 100 km/h. When the cousin reached the city at 7.55 p.m., Raeann had another 2 km to travel. What was Raeann’s average speed? Express your answer in mixed number.
Time that the Raeann's cousin started driving = 2.55 p.m.
Duration that Raeann's cousin drove from 2.55 p.m. to 7.55 p.m. = 5 h

Distance that Raeann's cousin travelled
= 5 x 100
= 500 km

Distance that Raeann travelled by the time her cousin reached the city
= 500 - 2
= 498 km

Time that Raeann took to travel 498 km = 8 h

Raeann's average speed
= 498 ÷ 8
= 62¹₄ km/h

Answer(s): 62¹₄ km/h