Multiple choice

A $100 \mathrm { m }$ long train crosses a man travelling at $5 \mathrm { km } / \mathrm { hr }$ in opposite direction, in $7.2 \text { seconds }$ then the velocity of train is

  1. $40 \mathrm { km } / \mathrm { hr }$
  2. $25 \mathrm { km } / \mathrm { hr }$
  3. $20 \mathrm { km } / \mathrm { hr }$
  4. $46.6 \mathrm { km } / \mathrm { hr }$
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D Correct answer