A travel a certain distance in X hours at Y km/ph. If I increase the speed by 20 km/ph, I can save an hour. However, on reducing my speed by 20 km/ph, I am on road for 2 hours more. What is X?

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A travel a certain distance in X hours at Y km/ph. If I increase the speed by 20 km/ph, I can save an hour. However, on reducing my speed by 20 km/ph, I am on road for 2 hours more. What is X?