exam Maths Puzzle Numerical Ability

One drain can empty a storage tank in 8.5 hours. When this drain is used along with a second drain, the tank can be emptied in 5 hours. How long (to the nearest 0.1 hour) would it take the second drain, working alone, to empty the tank?

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exam Other Question

It costs $1.50 per day to place a one line ad in the classifieds plus a flat service fee. One day costs $3.50 and four days costs $8.00. Write a linear equation that the cost in dollars, y, in terms of the number of days the ad appears, x. please help me Im having trouble solving this problem y2=25