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NIELIT 2019 Feb Scientist D - Section D: 22

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A train travelling from Delhi to Ambala meets with an accident after $1$ hr. It is stopped for $\frac{1}{2}$ hr, after which it proceeds at fourth-fifth of its usual rate, arriving at Ambala at $2$ hr late. If the train has covered $80$ km more before the accident, it would have been just $1$ hr late. The usual speed of the train is :

  1. $20$ km/hr
  2. $30$ km/hr
  3. $40$ km/hr
  4. $50$ km/hr
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