exam Maths Puzzle Numerical Ability

I DONT GET THIS WHAT IS 21 DIVIDED (2+1)X5-2^2 I CAN GET THE ANSWER I ALAYS GET 7 PLEASE HELP ME

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1. A jet travels 5600 Km in 7 hours. Flying with the jetstream the same jet travels 5500km in 5 hours. What is the speed of the jet in still air, and what is the speed of the jet 6x - 4 - 5x