book Maths Puzzle Numerical Ability

lynn can mow the lawn in 3 hours using a riding lawn mower. Her brother can mow the same lawn in 7 hours using a push mower. How long would it take them to mow the lawn working together?

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please help !
i have $10,000.00 -part at4% and part at5% simple intrest for 1 year.
how much was invested in each account if the 5% was $320.00 grater than the4%
thank you for y Any help would be appreciated.

There are 1200 students at a University taking Precalculus. Find the number of freshmen in this course if there are three-fifths as many freshmen