exam Maths Puzzle Numerical Ability

Stan and Hilda can mow the lawn in 40 min if they work together. If Hilda works twice as fast as Stan, how long does it take Stan to mow the lawn alone?

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Find the least value of the function. y=x squared+9 I am not sure how to set up the equation or how to solve this word problem.

Elena bicycles 5km/h faster then Carlos. In the same time it takes Carlos to bicycle 39km, Elena can bicycle 54km. How fst does each bicyclist travel?