Wendy left home at 11.15 a.m. and drove towards the suburb. 3 hours later, her uncle left their home and drove towards the same suburb at 91 km/h. When the uncle reached the suburb at 7.15 p.m., Wendy had another 3 km to travel. What was Wendy’s average speed? Express your answer in mixed number.
Time that the Wendy's uncle started driving = 2.15 p.m.
Duration that Wendy's uncle drove from 2.15 p.m. to 7.15 p.m. = 5 h

Distance that Wendy's uncle travelled
= 5 x 91
= 455 km

Distance that Wendy travelled by the time her uncle reached the city
= 455 - 3
= 452 km

Time that Wendy took to travel 452 km = 8 h

Wendy's average speed
= 452 ÷ 8
= 56¹₂ km/h

Answer(s): 56¹₂ km/h