Jade left home at 11.50 a.m. and drove towards the province. 2 hours later, her mother left their home and drove towards the same province at 96 km/h. When the mother reached the province at 4.50 p.m., Jade had another 4 km to travel. What was Jade’s average speed? Express your answer in mixed number.
Time that the Jade's mother started driving = 1.50 p.m.
Duration that Jade's mother drove from 1.50 p.m. to 4.50 p.m. = 3 h

Distance that Jade's mother travelled
= 3 x 96
= 288 km

Distance that Jade travelled by the time her mother reached the city
= 288 - 4
= 284 km

Time that Jade took to travel 284 km = 5 h

Jade's average speed
= 284 ÷ 5
= 56⁴₅ km/h

Answer(s): 56⁴₅ km/h