a car travels a distance of 715km at a uniform speed.if the speed of the car is 10 km/hr more , it takes 2 hrs less to cover the same distance.find the original speed of the car

Given : Total distance, D = 715 Km

To find : Speed of the car

We know,

Let the speed of the car be x km/hr.


When the car travels at uniform speed, time taken =  

If it travels at a speed of 10 km/hr more, time taken =

and the difference of time taken is 2 hrs, so the equation becomes

As the speed cannot be negative, so speed of the train, x = 55 km/hr. (Answer)

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 D is 715 km

let time  x hrs 

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