book Maths Puzzle Numerical Ability

My question is : A passenger train leaves the train depot 2 hours after a freight train leaves the same depot. The freight train is traveling 20 mph slower than the passenger tra

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x-2y=2
2x+3y=11

use substitution method to solve system
if dependant or inconsistant please indicate If $10,000 and $4000 are invested such that $1250 is earned in one year, and if the rate of interest on the larger investment is 2% more than that of the smaller investment, find the rates of interest.