exam Maths Puzzle Numerical Ability

A plan flies 300 miles with a tail wind in 1 hour. It takes the same plan 2 hours to fly the 300 miles when flying against the wind. What is the plane's speed in still air?

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exam Other Question

F(x)=3X^2-5x+3, Find [f(x+h)-f(x)}/h One grocery clerk can stock a shelf in 20 minutes, whereas a second clerk requires 30 minutes to stock the same shelf. If the two clerks worked together, how long would it take them to stock the shelf ?