Opal left home at 11.10 a.m. and drove towards the seaside resort. 3 hours later, her father left their home and drove towards the same seaside resort at 96 km/h. When the father reached the seaside resort at 7.10 p.m., Opal had another 2 km to travel. What was Opal’s average speed? Express your answer in mixed number.
Time that the Opal's father started driving = 2.10 p.m.
Duration that Opal's father drove from 2.10 p.m. to 7.10 p.m. = 5 h

Distance that Opal's father travelled
= 5 x 96
= 480 km

Distance that Opal travelled by the time her father reached the city
= 480 - 2
= 478 km

Time that Opal took to travel 478 km = 8 h

Opal's average speed
= 478 ÷ 8
= 59³₄ km/h

Answer(s): 59³₄ km/h