Fanny left home at 11.50 a.m. and drove towards the town. 3 hours later, her younger sister left their home and drove towards the same town at 88 km/h. When the younger sister reached the town at 6.50 p.m., Fanny had another 2 km to travel. What was Fanny’s average speed? Express your answer in mixed number.
Time that the Fanny's younger sister started driving = 2.50 p.m.
Duration that Fanny's younger sister drove from 2.50 p.m. to 6.50 p.m. = 4 h

Distance that Fanny's younger sister travelled
= 4 x 88
= 352 km

Distance that Fanny travelled by the time her younger sister reached the city
= 352 - 2
= 350 km

Time that Fanny took to travel 350 km = 7 h

Fanny's average speed
= 350 ÷ 7
= 50 km/h

Answer(s): 50 km/h