exam Maths Puzzle Numerical Ability

evaluate and simplify:
SQRT of 3(8 SQRT of 7- 4 SQRT of 3)

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exam Other Question

Speed: A boat travels 36 miles down a river in 3 hours. If it takes the boat 9 hours to travel the same distance going up the river, what is the speed of the boat? What is the speed of the current of the river? Please help me---I am not sure how to setup this problem in order to solve it.
Problem: Find the greatest possible pair of numbers such that one integer is 5 more than twice the other and the sum is less than 30.