Correct Answer: Option B
A : B = 100 : 90.
A : C = 100 : 72.
B : C = B/A×A/C=90/100×100/72= 90/72
When B runs 90 m, C runs 72 m.
When B runs 100 m, C runs {(72/90)×100}m = 80 m
So, B can give C 20 m.
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