CTS Company Numerical Ability Time Distance and Speed

In a 100m race X beats Y by 10m,Y beats Z by 10m.by how much does X beat Z in a 100m race? A)19m b)20m c)21m d)18m

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CTS Other Question
If 5 tomatoes costs 3 oranges and 5 oranges costs 6 potatoes and 2potatoes costs 4 apples and 7 apples costs Rs.203 then what is the cost of a tomato? Distance between two telegraph post is 100m.The two post is 130m away to the Listening Station.If a new Station is establish just between the Two post, then what will be the distance between two listening station?