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ATQ,
Time taken by pipe 'X' alone to fill the entire tank = 20 × 2 = 40 minutes
Let the efficiency of pipe 'X' = 'x' units/minute
Then, total capacity of the tank = 40x units
Efficiency of pipe 'Y' = x × 2 = 2x units/minute
So, quantity of tank filled by pipes 'X' and 'Y' together in 10 minutes = (x + 2x) × 10 = 30x units
Percentage of tank filled = (30x / 40x) × 100 = 75%
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