Infosys Company Numerical Ability Ratio and Proportion

In a 500 meters race, B gives `A` a start of 160 meters.

The ration of the speeds of `A` and `B` is 2:3 who wins by how much?

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Infosys Other Question

A, B and C are three participants in a kilometer race. If A can give B a start of 40 meters and B can give C a start of 25 meters, how many meters A can give C a start? there are boxes containing 5 , 7 , 14 , 16 , 18 , 29 balls of either red or blue in colour. Some boxes
contain only red balls and others contain only blue . One sales man sold one box out of them
and then he says " I have the same number of red balls left out as that of blue ".
Which box is the one he solds out ?