Marion left home at 10.35 a.m. and drove towards the town. 3 hours later, her uncle left their home and drove towards the same town at 98 km/h. When the uncle reached the town at 6.35 p.m., Marion had another 2 km to travel. What was Marion’s average speed? Express your answer in mixed number.
Time that the Marion's uncle started driving = 1.35 p.m.
Duration that Marion's uncle drove from 1.35 p.m. to 6.35 p.m. = 5 h

Distance that Marion's uncle travelled
= 5 x 98
= 490 km

Distance that Marion travelled by the time her uncle reached the city
= 490 - 2
= 488 km

Time that Marion took to travel 488 km = 8 h

Marion's average speed
= 488 ÷ 8
= 61 km/h

Answer(s): 61 km/h