exam Maths Puzzle Numerical Ability

2B(3-B?)/B^2-9

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After leaving the boathouse, a rower rowing upstream passes a log 2 km upstream from the boathouse. The rower rows upstream for one more hour and then rows back to the boathouse, arriving at the same time as the log. How fast was the current flowing? Mixing 100% antifreeze with 40% antifreeze to get 20 quarts of 50% antifreeze