Joelle left home at 11.25 a.m. and drove towards the province. 2 hours later, her uncle left their home and drove towards the same province at 76 km/h. When the uncle reached the province at 6.25 p.m., Joelle had another 2 km to travel. What was Joelle’s average speed? Express your answer in mixed number.
Time that the Joelle's uncle started driving = 1.25 p.m.
Duration that Joelle's uncle drove from 1.25 p.m. to 6.25 p.m. = 5 h

Distance that Joelle's uncle travelled
= 5 x 76
= 380 km

Distance that Joelle travelled by the time her uncle reached the city
= 380 - 2
= 378 km

Time that Joelle took to travel 378 km = 7 h

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

Answer(s): 54 km/h