exam Maths Puzzle Numerical Ability

Two trains leave the depot at the same time, one traveling east and the other west. The speed of one train is 9mph slower than the other. If after 4 hours the distance between the trains is 196 miles find the speed of each train.

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Graph y >- 3 - x Can someone help me on this problem?
I submitted this problem yesterday and did get a response, and the tutor got back quickly and drew up the graph for me, but the equation whic