book Maths Puzzle Numerical Ability

A plane flies 420 miles with the wind and 350 miles against the wind in the same length of time. If the speed of the wind is 23 mph, what is the speed of the plane in still air?

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book Other Question
solve the inequality,state the solution set using interval notation and graph the solution set.
4x^2-8x greater than or equal to 0 What is the prime factorization of 12q?