Calculate the average speed for the runners in the following races:

(a) \(100 \mathrm{~m}\) in \(9.84 \mathrm{~s}\),

(b) \(200 \mathrm{~m}\) in \(19.32 \mathrm{~s}\),

(c) \(400 \mathrm{~m}\) in \(43.29 \mathrm{~s}\),

(d) \(1500 \mathrm{~m}\) in \(3 \mathrm{~min}, 27. 37 \mathrm{~s}\),

(e) \(10 \mathrm{~km}\) in \(26 \mathrm{~min}, 38. 08 \mathrm{~s}\),

(f) marathon \((26 \mathrm{mi}\), \(385 \mathrm{yd})\) in \(2 \mathrm{~h}, 6 \mathrm{~min}, 50. 0 \mathrm{~s}\).