book Maths Puzzle Numerical Ability

A train leaves a station and travels west at 54mph. Four hours later, a second train leaves the same station and travels west at 90mph. When will the second train overtake the first?

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book Other Question

the denominator of a fraction is 1 more then the numerator. If the numerator is decreased by 1, the value of the resulting fraction is 3/4. What is the original fraction? (4/5)x + 18 = 12
(4/5)x = 12 + 18
(4/5)x = 30
x = 30(4/5)