exam Maths Puzzle Numerical Ability

ii. You participate in a triathlon in which you swam 3 miles, ran 5 miles, and then bicycled 10 miles. You ran twice as fast as you swam, and cycled three times as fast as you swam. If your total time was 1 hr and 46 minutes, how fast did you swim?

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3u^2+2u+2u^-2?.......how do you solve this? can you please help me solve this: [(a^5)(b^2)]^2 / [a^(-3)(b)]^2