Abi left home at 10.15 a.m. and drove towards the city. 3 hours later, her younger sister left their home and drove towards the same city at 97 km/h. When the younger sister reached the city at 6.15 p.m., Abi had another 3 km to travel. What was Abi’s average speed? Express your answer in mixed number.
Time that the Abi's younger sister started driving = 1.15 p.m.
Duration that Abi's younger sister drove from 1.15 p.m. to 6.15 p.m. = 5 h

Distance that Abi's younger sister travelled
= 5 x 97
= 485 km

Distance that Abi travelled by the time her younger sister reached the city
= 485 - 3
= 482 km

Time that Abi took to travel 482 km = 8 h

Abi's average speed
= 482 ÷ 8
= 60¹₄ km/h

Answer(s): 60¹₄ km/h