Question

a train goes from station A to B at a speed of 40km/hr and returns from station B to A at a speed of 60 km/hr.Find the average speed​

Answer 1

Answer:

40

Step-by-step explanation:

2 X 40 X 60                      

-------------------    

40 + 60

Answer 2

Answer:

Average speed=48 km/hr

Step-by-step explanation:

Average speed =Total distance /Total time taken

Let the distance be d.

So, total distance =d+d=2d

Now calculate T from A to B.

Time=Distance/Speed =d/40

Now calculate T from B to A.

Time =d/60

Total time= d/40+d/60=10d/240=d/24

Now calculate average speed

Total time/Toatal distance

2d/d/24=48km/hr