Wendy left home at 11.30 a.m. and drove towards the town. 2 hours later, her grandmother left their home and drove towards the same town at 98 km/h. When the grandmother reached the town at 4.30 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 grandmother started driving = 1.30 p.m.
Duration that Wendy's grandmother drove from 1.30 p.m. to 4.30 p.m. = 3 h

Distance that Wendy's grandmother travelled
= 3 x 98
= 294 km

Distance that Wendy travelled by the time her grandmother reached the city
= 294 - 3
= 291 km

Time that Wendy took to travel 291 km = 5 h

Wendy's average speed
= 291 ÷ 5
= 58¹₅ km/h

Answer(s): 58¹₅ km/h