Kimberly left home at 10.10 a.m. and drove towards the province. 3 hours later, her cousin left their home and drove towards the same province at 99 km/h. When the cousin reached the province at 5.10 p.m., Kimberly had another 4 km to travel. What was Kimberly’s average speed? Express your answer in mixed number.
Time that the Kimberly's cousin started driving = 1.10 p.m.
Duration that Kimberly's cousin drove from 1.10 p.m. to 5.10 p.m. = 4 h

Distance that Kimberly's cousin travelled
= 4 x 99
= 396 km

Distance that Kimberly travelled by the time her cousin reached the city
= 396 - 4
= 392 km

Time that Kimberly took to travel 392 km = 7 h

Kimberly's average speed
= 392 ÷ 7
= 56 km/h

Answer(s): 56 km/h