exam Maths Puzzle Numerical Ability

One pipe alone will fill a tank in 7 1/2 hrs. A second pipe will fill it alone in 10 hrs. I the second pipe were open for 8 hrs. and then closed, how long would the first pipe take to finish filling the tank?

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Can you please help me with these problems I would appreciate it. Thank you so much.
Express as a product:
log base 3^4 radical sign x
Solve for x:
log base 10^7=log base 10^x find two consecuive positive integers if the difference of their reciprocals is 1/12