Callum and his family are going to the beach for the day to make the most of the good weather.
The total distance to the beach is 184 miles and it takes 3 ½ hours.
Callum drives 60 miles on ordinary roads and the rest of the journey on the motorway.
He drives at an average speed of 40mph on the ordinary roads.
Work out Callum’s average speed on the motorway.
Answer
Time on ordinary roads:
T = D/S = 60/40 =1.5 hrs
Time on motorway = 3.5 – 1.5 = 2 hrs
Therefore:
Av speed on motorway = (184 – 60) / 2 =62 mph