Diana left home at 11.50 a.m. and drove towards the town. 2 hours later, her cousin left their home and drove towards the same town at 92 km/h. When the cousin reached the town at 5.50 p.m., Diana had another 5 km to travel. What was Diana’s average speed? Express your answer in mixed number.
Time that the Diana's cousin started driving = 1.50 p.m.
Duration that Diana's cousin drove from 1.50 p.m. to 5.50 p.m. = 4 h

Distance that Diana's cousin travelled
= 4 x 92
= 368 km

Distance that Diana travelled by the time her cousin reached the city
= 368 - 5
= 363 km

Time that Diana took to travel 363 km = 6 h

Diana's average speed
= 363 ÷ 6
= 60¹₂ km/h

Answer(s): 60¹₂ km/h