exam Maths Puzzle Numerical Ability

the speed of an airplane in still air is 286 km/h it travels 883 km against the wind and 1119 km with the wind in total time is 13 hr.

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exam Other Question

describe a pattern in the sequence of numbers. Predict the next number:
1,2,4,7,11...
Factor out the greatest common factor

30x^4 - 48x^2 +15x