a) 27 m
b) 29 m
c) 30 m
d) 25 m
Answer: b
Explanation: B : A = 200 : 190
C : B = 200 : 180
$$\eqalign{
& = \frac{C}{A} \cr
& = {\frac{C}{B} \times \frac{B}{A}} \cr
& = {\frac{{200}}{{180}} \times \frac{{200}}{{190}}} \cr
& = \frac{{200}}{{171}} \cr} $$
C can give to A, a start of (200 – 171) m = 29 m.
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