Practice | Hashtable

1. In a race of 200 m, B can give a start of 10 m to A and C can give a start of 20 m to B. The start that C can give to A in the same race is ?

A. 27 m

B. 29 m

C. 30 m

D. 25 m

Solution:

B : A = 200 : 190
C : B = 200 : 180

\begin{aligned} = \frac{C}{A} \\ = \frac{C}{B} \times \frac{B}{A} \\ = \frac{200}{180} \times \frac{200}{190} \\ = \frac{200}{171} \end{aligned}

∴ C can give to A, a start of (200 - 171) m = 29 m

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