Wendy left home at 11.50 a.m. and drove towards the countryside. 2 hours later, her father left their home and drove towards the same countryside at 95 km/h. When the father reached the countryside at 6.50 p.m., Wendy had another 6 km to travel. What was Wendy’s average speed? Express your answer in mixed number.
Time that the Wendy's father started driving = 1.50 p.m.
Duration that Wendy's father drove from 1.50 p.m. to 6.50 p.m. = 5 h

Distance that Wendy's father travelled
= 5 x 95
= 475 km

Distance that Wendy travelled by the time her father reached the city
= 475 - 6
= 469 km

Time that Wendy took to travel 469 km = 7 h

Wendy's average speed
= 469 ÷ 7
= 67 km/h

Answer(s): 67 km/h