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Mathematics

The speed of train A is x km/hr and speed of train B is (x - 5) km/h. How much time will each train take to cover 400 km ?

  1. x400 hrs and x−5400\dfrac{x}{400} \text{ hrs and } \dfrac{x - 5}{400} hrs

  2. x × 400 hrs and (x - 5) × 400 hrs

  3. 400x hrs and 400x−5\dfrac{400}{x} \text{ hrs and } \dfrac{400}{x - 5} hrs

  4. 800x(x−5)\dfrac{800}{x(x - 5)} hrs

Quadratic Equations

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Answer

By formula,

Time = DistanceSpeed\dfrac{\text{Distance}}{\text{Speed}}

For train A :

Time taken = 400x\dfrac{400}{x} hrs.

For train B :

Time taken = 400x−5\dfrac{400}{x - 5} hrs.

Hence, Option 3 is the correct option.

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