exam Maths Puzzle Numerical Ability

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c+3)-2C-(1-3c)=2

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exam Other Question

A 6-passenger plane cruises at 180 mph in calm air. If the plane files 7 miles with the wind in the same smount of time as it flies 5 miles against the wind, then what is the wind speed? If there are 6 x109 people on the Earth and there is enough freshwater to provide each person with 8.79 x 105 L, how much freshwater is on the Earth?