exam Maths Puzzle Numerical Ability

3+2*5-4

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exam Other Question

I am very stuck can someone pleas help me?
Science and medicine. A plane flies 720 mi against a steady 30-mi/h headwind
and then returns to the same point with the wind. If the entire trip takes 10 h, what is the plane�s speed in still air? 8x-y=17
6x+y=11

Find the value of the variables......

Please help, I keep coming up with a fraction.

Thank you!

Amanda