Vanessa left home at 11.25 a.m. and drove towards the province. 3 hours later, her grandfather left their home and drove towards the same province at 96 km/h. When the grandfather reached the province at 7.25 p.m., Vanessa had another 6 km to travel. What was Vanessa’s average speed? Express your answer in mixed number.
Time that the Vanessa's grandfather started driving = 2.25 p.m.
Duration that Vanessa's grandfather drove from 2.25 p.m. to 7.25 p.m. = 5 h

Distance that Vanessa's grandfather travelled
= 5 x 96
= 480 km

Distance that Vanessa travelled by the time her grandfather reached the city
= 480 - 6
= 474 km

Time that Vanessa took to travel 474 km = 8 h

Vanessa's average speed
= 474 ÷ 8
= 59¹₄ km/h

Answer(s): 59¹₄ km/h