book Maths Puzzle Numerical Ability

An empty swimming pool can be filled in 5hrs. When full, the pool can be drained in 17hrs. How long will it take to fill the empty pool if the drain is left open?

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book Other Question

Simplify (3rd sqrt 9/8x)^-6 saul's army traveled 135 miles in 4 hours fewer than it took David's army to travel 945 miles. if the speed of David's army was three times that of Saul's what was the speed of eac