exam Maths Puzzle Numerical Ability

a train leaves a station and travels east at 72km/h. three hours later a second train leaves on a parallel track and travels at 120km/h. When will the second train overtake the first train?

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exam Other Question

How do you solve the equation:
(5x+6*9/8)+(5y*6)4(24)=(546+45x)(10y) please help me. i cant figure out how to do this. thank you for your time in trying to figure this out!
compare the graph of the function with the graph of f(x)=square root x.
y=-squarerootx