A can give 40 metres start to B and 70 metres to C in a race of one kilometre how many metres start can B give to C in a race of one kilometre?

\[\begin{array}{*{20}{c}} {\text{A}}&{\text{B}}&{\text{C}} \\ {1000}&{960}&{930} \end{array}\]
⇒ B can give C a start of 30 meters in a 960 meters race
$$\eqalign{ & \Rightarrow 960\,{\text{units}} \to 30 \cr & 1\,{\text{unit}} \to \frac{1}{{32}} \cr & 1000\,{\text{units}} \to \frac{{1000}}{{32}} = 31\frac{1}{4}{\text{ meters}} \cr} $$