book Maths Puzzle Numerical Ability

The line that has a slope 1/2 and contains (5,6)

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I am having trouble solving the following problem. Please help.

seven thirds x = two thirds. It is a fraction equation. a freight train averaging 45 mi/hr and an express train averaging 70 mi/hr leave the station at the same time. how long will it take the express train to overtake the frt. train by