exam Maths Puzzle Numerical Ability

a man at A walks to a neigborhoring town, B, at the rate of 5mph and returns at a alower rate of 4mph. if it took him 3 hours and 9 minutes for the entire trip, how far is town from A.

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I need help. I am lost on this algebra.

The area of a rectangle is 119 m2. The base is four less than three times the height. What is the length of the base? A merchant has coffee worth $40 a pound that she wishes to mix with 20 pounds of coffee worth $80 a pound to get a mixture that can be sold for $50 a pound. How many pounds of the $40 coffee should be used?