book Maths Puzzle Numerical Ability

(s/2-r+3/4=-1/2

2r-1/3-3s/4=-5/12

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book Other Question

An express train leaves Cedarville at the same time a passanger train leaves Pine City, 470 miles away. The express train, traveling 10 mph faster, passes the other train in 2.5 ho How do I divide this equation using a+bi form 6/2+4i