Hazel left home at 11.45 a.m. and drove towards the town. 3 hours later, her mother left their home and drove towards the same town at 82 km/h. When the mother reached the town at 7.45 p.m., Hazel had another 6 km to travel. What was Hazel’s average speed? Express your answer in mixed number.
Time that the Hazel's mother started driving = 2.45 p.m.
Duration that Hazel's mother drove from 2.45 p.m. to 7.45 p.m. = 5 h

Distance that Hazel's mother travelled
= 5 x 82
= 410 km

Distance that Hazel travelled by the time her mother reached the city
= 410 - 6
= 404 km

Time that Hazel took to travel 404 km = 8 h

Hazel's average speed
= 404 ÷ 8
= 50¹₂ km/h

Answer(s): 50¹₂ km/h