exam Maths Puzzle Numerical Ability

Jonathan and Tim started Running toward each other. Jonathan at 16 yards per minute and Tim at 18 yards per minute. If they were 1,360 yards apart when they started running, how long did it take for them to collide?

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exam Other Question
c=√(a^2+b^2 )solve for "a"
Does anyone know how to figure out for "a" instead of "c"? Help please, and thank you so much!! Which of the following objective functions has its maximum value at (0,24.5)?