Question 5
A RED car took 2 h to travel from town X to town Y. His average speed for the whole journey was 40 km/h. For the first  of the journey, he traveled at an average speed of 50 km/h. Find his average speed for the second part of the journey



Solution
2  X 40 = 100 km
100 X (1/4)  = 25 km
100 25 = 75 km
time taken for (1/4)  of journey = 25/50 
=  1/2 h
time taken for 2nd part of journey = 2.5  0.5
= 2h
Average speed = 75km /  2
= 37.5km/h

or 2.5  X 40 = 100 km
100 x (3/4) = 75
75 2 = 37.5 km/h