A car travelled to town B from Town A at a constant speed of 72 km/hr. It then returned from town B to town A at a constant speed of 48km/hr. What is the average speed of the car for the whole journey?
Add the two speeds together. Then, divide the sum by two. This will give you the average speed for the entire trip.
[tex]s = \frac{a + b}{2} [/tex]
s – equal average speed
a – first given speed
b – second given speed
Given:
72 km/hr
48km/hr
Solution:
[tex]s = \frac{72 + 48}{2} [/tex]
[tex]s = \frac{120}{2} [/tex]
[tex]s = 60[/tex]
Answer:
The average speed of the car for the whole journey is 60 km/hr.
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