a car travels A certain distance with the speed of 50 km per hour and returns with a speed of 40 kilometre per hour calculate the average speed
Let journey be from A to B & distance between A to B is x km.
Going speed 50 km/ hr. Distance = x.
Time taken = x / 50 hr.
Returning back from B to A:
Distance = x km.
Speed = 40 km/ hr.
Time taken = x / 40 hr.
Average speed =
Total distance covered/ total time taken
= 2*x / (x/50 + x/40)
= 2 * 50 * 40 / 90
= 4000/90 = 44.44 km/ hr.
Answer: Average speed 44.44 km/ hr.