A passenger train takes 2 hours less ...

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 the usual speed of the train.

35 km/hr

30 km/hr

25 km/hr

45 km/hr

Text Solution

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The correct Answer is:

`(300)/(x)-(300)/(x+5)=2implies(1)/(x)-(1)/(x+5)=(1)/(150)impliesx^(2)+5x-750=0.`
`impliesx^(2)+30x-25x-750=0.`

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