Emily left home at 10.25 a.m. and drove towards the seaside resort. 3 hours later, her younger brother left their home and drove towards the same seaside resort at 97 km/h. When the younger brother reached the seaside resort at 5.25 p.m., Emily had another 3 km to travel. What was Emily’s average speed? Express your answer in mixed number.
Time that the Emily's younger brother started driving = 1.25 p.m.
Duration that Emily's younger brother drove from 1.25 p.m. to 5.25 p.m. = 4 h

Distance that Emily's younger brother travelled
= 4 x 97
= 388 km

Distance that Emily travelled by the time her younger brother reached the city
= 388 - 3
= 385 km

Time that Emily took to travel 385 km = 7 h

Emily's average speed
= 385 ÷ 7
= 55 km/h

Answer(s): 55 km/h