exam Maths Puzzle Numerical Ability

can someone help me to perform operation and simplify if possible I also need to know how to set it up
6/x+5 - 4/x-5

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exam Other Question

A certin sum of money is invested at 10%. Twice that amount is invested at 8%. The total amount of intrest from both investments is $91. How much is invested at 8%. a cold water faucet could fill a sink in 15 minutes, and a hot water faucet can fill it in 12 minutes. the drain can empty the sink in 25 minutes. if both faucets are on and the drain is open, how long will it take to fill the sink?