Winnie left home at 11.30 a.m. and drove towards the seaside resort. 2 hours later, her uncle left their home and drove towards the same seaside resort at 97 km/h. When the uncle reached the seaside resort at 4.30 p.m., Winnie had another 5 km to travel. What was Winnie’s average speed? Express your answer in mixed number.
Time that the Winnie's uncle started driving = 1.30 p.m.
Duration that Winnie's uncle drove from 1.30 p.m. to 4.30 p.m. = 3 h

Distance that Winnie's uncle travelled
= 3 x 97
= 291 km

Distance that Winnie travelled by the time her uncle reached the city
= 291 - 5
= 286 km

Time that Winnie took to travel 286 km = 5 h

Winnie's average speed
= 286 ÷ 5
= 57¹₅ km/h

Answer(s): 57¹₅ km/h