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A runs 25% faster than B and is able to give him a start of 7 meters to end a race in dead heat. What is the length of the race?

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ANS: 35 Meters

A runs 25% as fast as B.
That is, if B runs 100m in a given time, then A will run 125m in the same time
In other words, if A runs 5m in a given time, then B will run 4m in the same time.
Therefore, if the length of a race is 5m, then A can give B a start of 1m so that they finish the race in a dead heat.
Start:length of race :: 1:5
we know that the start is 7m. length of the race will be 7/x=1/5. i.e.7*5=35m.
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