exam Maths Puzzle Numerical Ability

The speed of a passenger train is 14 mph faster than the speed of a feight train. The passenger train travels 400 mi in the same time that it takes the freight train to travel 330 mi. Find the speed of each train.

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3rd time lucky maybe

I need some help on one of my questions. I need to make g the subject...

T = 2(pi)*[square root of (l/g^3)}

Can someone please help me......: and its the letter L not the number 1 a model is being created froma picture frame which has a length if 4 3/4 inches..if the scale to be used is 8 inches = 1 inch,what is the length of the model..???