Irene left home at 11.35 a.m. and drove towards the campsite. 2 hours later, her auntie left their home and drove towards the same campsite at 94 km/h. When the auntie reached the campsite at 5.35 p.m., Irene had another 4 km to travel. What was Irene’s average speed? Express your answer in mixed number.
Time that the Irene's auntie started driving = 1.35 p.m.
Duration that Irene's auntie drove from 1.35 p.m. to 5.35 p.m. = 4 h

Distance that Irene's auntie travelled
= 4 x 94
= 376 km

Distance that Irene travelled by the time her auntie reached the city
= 376 - 4
= 372 km

Time that Irene took to travel 372 km = 6 h

Irene's average speed
= 372 ÷ 6
= 62 km/h

Answer(s): 62 km/h