book Maths Puzzle Numerical Ability

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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?

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book Other Question

a to b is 10 miles further than b to c. b to c is 10 miles further than c to d. the distance from a to d is 390 miles..what is the distance from a to b? 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?