Question

A train first 200 km of journy in 4 hours , next 200 km in 3 hours and the final 100 km in 2 hours . Calculate its average speed

Answer 1

You must know that average speed of a body is total distance travelled divided by total time taken so 
average speed in this case =
500/9 km/h

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Answer 2

Average Speed = Total distance / Total time

A.S. = 200 + 200 +100 / 4 + 3 + 2

= 500 / 9 = 55.5555556 km/h