Wendy left home at 10.20 a.m. and drove towards the countryside. 3 hours later, her auntie left their home and drove towards the same countryside at 89 km/h. When the auntie reached the countryside at 6.20 p.m., Wendy had another 5 km to travel. What was Wendy’s average speed? Express your answer in mixed number.
Time that the Wendy's auntie started driving = 1.20 p.m.
Duration that Wendy's auntie drove from 1.20 p.m. to 6.20 p.m. = 5 h

Distance that Wendy's auntie travelled
= 5 x 89
= 445 km

Distance that Wendy travelled by the time her auntie reached the city
= 445 - 5
= 440 km

Time that Wendy took to travel 440 km = 8 h

Wendy's average speed
= 440 ÷ 8
= 55 km/h

Answer(s): 55 km/h