Wendy left home at 11.45 a.m. and drove towards the seaside resort. 2 hours later, her older brother left their home and drove towards the same seaside resort at 84 km/h. When the older brother reached the seaside resort at 4.45 p.m., Wendy had another 2 km to travel. What was Wendy’s average speed? Express your answer in mixed number.
Time that the Wendy's older brother started driving = 1.45 p.m.
Duration that Wendy's older brother drove from 1.45 p.m. to 4.45 p.m. = 3 h

Distance that Wendy's older brother travelled
= 3 x 84
= 252 km

Distance that Wendy travelled by the time her older brother reached the city
= 252 - 2
= 250 km

Time that Wendy took to travel 250 km = 5 h

Wendy's average speed
= 250 ÷ 5
= 50 km/h

Answer(s): 50 km/h