2013 · Q41
A man cycles at 10 kmph and reaches office at 1 p.m. At 15 kmph he reaches at 11 a.m. At what speed should he cycle to reach at 12 noon?
Elementary MathematicsArithmetic
- A12 kmph
- B12 kmph
- C13 kmph
- D14 kmph
Explanation
Harmonic mean: 2×10×15/25=12. Answer B.