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Multiple choice

A car starts from rest and attains the speed of $1\ km/hr$ and $2kms/hr$ at the end of $1st$ and $2nd$ minutes. If the car moves on a straight road, the distance travelled in $2$ minutes is

  1. $\dfrac {1}{20} km$
  2. $\dfrac {1}{30} km$
  3. $15\ km$
  4. $20\ km$
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