exam Maths Puzzle Numerical Ability

One pipe can fill a tank in 6 hours, and another pipe can fill the same tank in 8 hours. How long will it take to fill the tank if both pipes are used?

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exam Other Question

the square root of 10 times the square root of 16 divided by the square root of 5 If I am given three points and ask to find a fourth so that they are vertices of a parallelogram, how do I find the fourth?