exam Maths Puzzle Numerical Ability

There are two water hoses. One fills a bucket in 30 min, the other hose fills at a rate of 45 min. How long to fill a bucket using both buckets? How do I set this up in an equation?

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exam Other Question

simplify (rad)2*(rad)3. isnt this just (rad)6 ? Can you tell and explain the equation of the line with given slope and y-intercept. Then graph each line using
the slope and y-intercept.

Slope: - 3/4; y-intercept: (0, 8)