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?

Answer: Option C

\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
$$\begin{array}{rl}& \Rightarrow 960\text{units}\to 30\\ & 1\text{unit}\to \frac{1}{32}\\ & 1000\text{units}\to \frac{1000}{32}=31\frac{1}{4}\text{ meters}\end{array}$$