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  1. A man goes from a place A to B at a speed of 12 km/hr and returns from B to A at a speed of 18 km/hr. The average speed for the whole journey is
    1. 14
      2
      		km/hr
      5
    2. 15 km/hr
    3. 15
      1
      		km/hr
      2
    4. 16 km/hr
Correct Option: B

Average speed =
2xy
kmph
x + y

=
2 × 12 × 18
kmph
12 + 18

=
2 × 12 × 18
kmph
30

= 14
2
kmph
5


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