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Bunuel KarishmaB kevincan
From the given data we can still find out that 200 km was travelled in 4/3 hrs and from here we can find the speed for 200 km which is again 150 km/hr
What am I doing wrong over here?
You cannot say that the 200 km took 4/3 hours. The 150 km/h average applies to the whole 600 km, not to every part of it.

For example, the overlapping 200 km could take 1 hour. Then the other 400 km in each 600 km section would take 3 hours, so each 600 km section still takes 4 hours.

Or the overlapping 200 km could take 2 hours. Then the other 400 km in each section would take 2 hours, and again each 600 km section takes 4 hours.

So both cases satisfy the statements, but the total trip time is different. Therefore, the overall average speed cannot be determined.
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