Multiple choice

A body moving along a straight line travels one third of the total distance with a speed of 3.0$\mathrm { m } \mathrm { s } ^ { - 1 }$ . The remaining distance is covered with a speed of 4.0$\mathrm { ms } ^ { - 1 }$ for half the time and $5.0\mathrm { ms } ^ { - 1 }$ for the other half of the time. The average speed during the motion is

  1. $4.0 m s ^ { - 1 }$
  2. $6.0 m s ^ { - 1 }$
  3. $3.8 m s ^ { - 1 }$
  4. $2.4 m s ^ { - 1 }$
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