exam Maths Puzzle Numerical Ability

Could you please help me with this problem.

y varies jointly as a and b and inversely as the spuare root of c. y=48 when a=4, b=8, and c=36. Find y when a=2, b=7, and c=16.

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exam Other Question

Show that x-a-b is a factor of (x^3)-(a^3)-(b^3)-3ab(a+b), preferably using synthetic division. An express train and a local train leave Gray�s Lake at 3 P.M. and head for Chicago 50 miles away. The express travels twice as fast as the local and arrives 1 hour ahead of the local. Find the speed of each train.