Linda left home at 11.20 a.m. and drove towards the town. 2 hours later, her auntie left their home and drove towards the same town at 100 km/h. When the auntie reached the town at 4.20 p.m., Linda had another 3 km to travel. What was Linda’s average speed? Express your answer in mixed number.
Time that the Linda's auntie started driving = 1.20 p.m.
Duration that Linda's auntie drove from 1.20 p.m. to 4.20 p.m. = 3 h

Distance that Linda's auntie travelled
= 3 x 100
= 300 km

Distance that Linda travelled by the time her auntie reached the city
= 300 - 3
= 297 km

Time that Linda took to travel 297 km = 5 h

Linda's average speed
= 297 ÷ 5
= 59²₅ km/h

Answer(s): 59²₅ km/h