Nora left home at 10.15 a.m. and drove towards the campsite. 3 hours later, her cousin left their home and drove towards the same campsite at 82 km/h. When the cousin reached the campsite at 6.15 p.m., Nora had another 6 km to travel. What was Nora’s average speed? Express your answer in mixed number.
Time that the Nora's cousin started driving = 1.15 p.m.
Duration that Nora's cousin drove from 1.15 p.m. to 6.15 p.m. = 5 h

Distance that Nora's cousin travelled
= 5 x 82
= 410 km

Distance that Nora travelled by the time her cousin reached the city
= 410 - 6
= 404 km

Time that Nora took to travel 404 km = 8 h

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

Answer(s): 50¹₂ km/h