In a race of 200 metres, B can give a start of 10 metres

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

1. 30 m
2. 29 m
3. 27 m
4. 25 m

Correct Option: B

B covers 200 m while A 190 m
B covers 180 m while A 190 x 180 / 200 = 171 m
Hence, C covers 200 m while A = 171 m
So, C can give to A (200 – 171) = 29 m start.