A car moves between two station A and B. It moves with a speed of 20 km/h from A to B and returns from B to A at a speed of 10 km/h. The average speed between A and B is
Answers
Given : A car moves between two station A and B.
It moves with a speed of 20 km/h from A to B and returns from B to A at a speed of 10 km/h.
To Find : The average speed
Solution:
Distance = Speed * Time
Let say Distance between A and B is 20D km
moves with a speed of 20 km/h from A to B
Time = 20D/20 = D hrs
moves with a speed of 10 km/h from B to A
Time = 20D/10 = 2D hrs
Total Distance = 20D + 20D = 40D km
Total Time = D + 2D = 3D hrs
Average Speed = (40D/3D) = 40/3 km/hr
The average speed is 40/3 km/hr
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Answer:
Distance Speed * Time =
Let say Distance between A and B is 20D km
moves with a speed of 20 km/h from A to B
Time = 20D/20 = D hrs
moves with a speed of 10 km/h from B to A
Time = 20D/10 = 2D hrs
Total Distance = 20D + 20D = 40D km
Total Time = D + 2D = 3D hrs
Average Speed = (40D/3D) = 40/3 km/hr
The average speed is 40/3 km/hr.