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A passenger train takes 2 hours less for a journey of 300 km if its speed is increased by 5 km/hr

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A passenger train takes 2 hours less for a journey of 300 km if its speed is increased by 5 km/hr from its usual speed. Find its usual speed.

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Let the usual speed x km/hr. 

According to the question:

The usual speed cannot be negative; therefore, the speed is 25 km/hr.

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