Answer Posted / anurag gour

Let Speed of A be 10m/s. Therefore, accordingly speed of B will be 9m/s.

Now time taken by B to complete the race of 100m will be:
=>100/9=11.1sec

Now in 11.1sec C has covered 80m as C is defeated by 20m.
Speed of C=80/11.1 = 7.207m/s.

Since A has covered his race in 10sec(100m/10m/s). Therefore distance covered by C in 10 sec = 7.207x10 = 72.07m or 72m.

So, A defeats C by 100-72=28m.

Answer is 28m.

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