exam Maths Puzzle Numerical Ability

In my class today, we learned rates. Here is one of my problems: 55mi/h=?ft/s I have no clue what to do. I wrote out 55mi * ____ = ____ft
1 h s
What am I supposed to do next?

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exam Other Question
Factor completlety 16x^2-2x-3 Bob can do a job in 1 hour, John can do the same job in 2 hours, Lisa can do the same job in 3 hours. How long would the job take if they all work together?