exam Maths Puzzle Numerical Ability

A plane can travel 400 miles against the wind in the same time that it can travel 500 miles with the wind. If the speed of wind was 10 miles per hour. Find the speed of the plane in still air.

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when doing this problem can you use the cross multiply method or do you use the LCM/LCD method. I tried to do the cross mulitply method but the answer did not turn out right.....Can you help How can I determine the correct half-plane boundry line graphed for this linear inequality. y>3?