exam Maths Puzzle Numerical Ability

with a tail wind, a helicopter traveled 300mi in an hour and 40 min. the return trip aganst the same wind took 20 min longer. find the wind speed and also the air speed of the helicopter.

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exam Other Question
What is the annual rate of increase of the U.S. population? Where did you find the information needed? Solve the equation aT = b+aM-bT÷3 for the variable T.