Dana left home at 11.40 a.m. and drove towards the suburb. 2 hours later, her cousin left their home and drove towards the same suburb at 93 km/h. When the cousin reached the suburb at 4.40 p.m., Dana had another 2 km to travel. What was Dana’s average speed? Express your answer in mixed number.
Time that the Dana's cousin started driving = 1.40 p.m.
Duration that Dana's cousin drove from 1.40 p.m. to 4.40 p.m. = 3 h

Distance that Dana's cousin travelled
= 3 x 93
= 279 km

Distance that Dana travelled by the time her cousin reached the city
= 279 - 2
= 277 km

Time that Dana took to travel 277 km = 5 h

Dana's average speed
= 277 ÷ 5
= 55²₅ km/h

Answer(s): 55²₅ km/h