book Maths Puzzle Numerical Ability

Working together, two pipes, A and B, can fill a tank in 4h. It takes pipe A 6h longer than pipe B to fill the tank alone. How long would it take each pipe alone to fill the tank?

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book Other Question

Solve and show all work please.

Jane can mow the lawn in 3 hours, and Lester can mow it in 4 hours. If they work together, how long will it take them to mow the lawn? I am a two digit number. I am twice the product of my digits. What number am I

More importantly, how do I solve these types of questions?