Linda left home at 10.20 a.m. and drove towards the countryside. 3 hours later, her younger brother left their home and drove towards the same countryside at 98 km/h. When the younger brother reached the countryside at 6.20 p.m., Linda had another 2 km to travel. What was Linda’s average speed? Express your answer in mixed number.
Time that the Linda's younger brother started driving = 1.20 p.m.
Duration that Linda's younger brother drove from 1.20 p.m. to 6.20 p.m. = 5 h

Distance that Linda's younger brother travelled
= 5 x 98
= 490 km

Distance that Linda travelled by the time her younger brother reached the city
= 490 - 2
= 488 km

Time that Linda took to travel 488 km = 8 h

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

Answer(s): 61 km/h