exam Maths Puzzle Numerical Ability

Find the slope of the line passing through the points (11, 16) and (4, 9).

I have a slope of 9

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exam Other Question

A bus leaves a station at 1 p.m., traveling west at an average rate of 44 mi/h. One hour later a second bus leaves along the same route, traveling at 54 mi/h. At what time will the two buses be 274 mi apart? how i can dou that?