Pamela left home at 11.30 a.m. and drove towards the seaside resort. 2 hours later, her grandmother left their home and drove towards the same seaside resort at 71 km/h. When the grandmother reached the seaside resort at 6.30 p.m., Pamela had another 5 km to travel. What was Pamela’s average speed? Express your answer in mixed number.
Time that the Pamela's grandmother started driving = 1.30 p.m.
Duration that Pamela's grandmother drove from 1.30 p.m. to 6.30 p.m. = 5 h

Distance that Pamela's grandmother travelled
= 5 x 71
= 355 km

Distance that Pamela travelled by the time her grandmother reached the city
= 355 - 5
= 350 km

Time that Pamela took to travel 350 km = 7 h

Pamela's average speed
= 350 ÷ 7
= 50 km/h

Answer(s): 50 km/h