book Maths Puzzle Numerical Ability

what r the answers to the following inequalities

x-5>4?
4x<-8

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book Other Question

A train leaves a station and travels east at 72 km/h. Three hours later a second train leaves on a parrallel track and travels east at 120 km/h. When will it overtake the first train? how do you find the hypotenuse of a 45-45-90 degree triangle if the legs are 7 inches? please give steps and answer!