book Maths Puzzle Numerical Ability

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?

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book Other Question

Mixing Antifreeze
A radiator holds 5 gallons of fluid. It is full with a 15% solution, how much fluid should be drained and replaced with 65% antifreeze mixture to result in a 40 what r the answers to the following inequalities

x-5>4?
4x<-8