Emily left home at 11.35 a.m. and drove towards the campsite. 2 hours later, her mother left their home and drove towards the same campsite at 99 km/h. When the mother reached the campsite at 4.35 p.m., Emily had another 3 km to travel. What was Emily’s average speed? Express your answer in mixed number.
Time that the Emily's mother started driving = 1.35 p.m.
Duration that Emily's mother drove from 1.35 p.m. to 4.35 p.m. = 3 h

Distance that Emily's mother travelled
= 3 x 99
= 297 km

Distance that Emily travelled by the time her mother reached the city
= 297 - 3
= 294 km

Time that Emily took to travel 294 km = 5 h

Emily's average speed
= 294 ÷ 5
= 58⁴₅ km/h

Answer(s): 58⁴₅ km/h