Roshel left home at 11.20 a.m. and drove towards the city. 3 hours later, her cousin left their home and drove towards the same city at 96 km/h. When the cousin reached the city at 6.20 p.m., Roshel had another 6 km to travel. What was Roshel’s average speed? Express your answer in mixed number.
Time that the Roshel's cousin started driving = 2.20 p.m.
Duration that Roshel's cousin drove from 2.20 p.m. to 6.20 p.m. = 4 h

Distance that Roshel's cousin travelled
= 4 x 96
= 384 km

Distance that Roshel travelled by the time her cousin reached the city
= 384 - 6
= 378 km

Time that Roshel took to travel 378 km = 7 h

Roshel's average speed
= 378 ÷ 7
= 54 km/h

Answer(s): 54 km/h