Answer :

CmdrWinters
2/5 * 5/7 * 1/2                   <== Group first pair of fractions to make
                                          multiplication easier

(2/5 * 5/7) * 1/2                 <== Multiply fractions in parentheses, keeping in
   (10/35)                             mind all rules of fraction multiplication (i.e.
     (2/7)                              cross-multiplying, etc.)

  2/7 * 1/2                          <== Multiply remaining fractions

       1/7        

The problem simplifies to 1/7.
Hope that helped =)

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