Question
In a 550-metre race, βAβ beats βBβ by 12 seconds
or 60 metres. Find the time taken by βBβ to finish the race.Solution
Speed of βBβ = (60/12) = 5 m/s Time taken by βBβ to finish the race = 550 Γ· 5 = 110 seconds
If n(A) = 25, n(B) = 40 and n(A βͺ B) = 50, then n(A β© B) equals
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