exam Maths Puzzle Numerical Ability

The manager of a computer software company wishes to study the number of hours senior executives spend at their desktop computers by type of industry. The manager selected a sample

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Pipe A can fill a tank in 8 hours. When both A and pipe B are used th tank is filled in 5 hours. How long,in hours,would it take pipe B alone to fill the tank? How do you do a problem like 4 next to the square root sign of 50? 50 is under the sign and 4 is to the immediate left.