exam Maths Puzzle Numerical Ability

A hose can fill a swimming pool in 6 hours. Another hose needs 3 more hours to fill the pool than the two hoses combined. How long would it take the second hose to fill the pool?

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Please can someone help me. I am having trouble with this problem on a homework sheet.

3.) Write the series in summation notation. Use the index i and let i begin at 1 in each I need help please

6x+5=3x+6

5x+8=x+5

9x+1=3x-4

2x-3=6x-4

3/4x+2=1/4x-9

THANK YOU