exam Maths Puzzle Numerical Ability

the speed of the airplane in still air is 186mph. the plane travals 538 mi againt the wind and 1415 mi with the wind in a total time of 12 hr. what is the speed of the wind

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Multiply. (-1/10) (40)
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I am not sure how to make the "Big Parenthesis" that is supposed to be around the -1/10 fraction. Can someone please help me? -4 sq root3 - sq root36 + 3 sq root 48 =?