exam Maths Puzzle Numerical Ability

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.

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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. <a is complementary to <c. If <a=2x-10 and <c=4x+10, find the m<a and m<c.