The distance traveled varies directly with the time spent in motion when speed is held constant. if d represents the distance traveled and t represents time, which equation would represent this variation?

Direct proportionality occurs when an increase quantity or a variable causes a corresponding increase in another variable and vice versa. In this case, when distance increases it causes an increase in time taken if speed is kept constant.
Therefore, d α t
 mathematically; d = kt , where k is a constant,
Hence; d = st since s is the constant.
Therefore the equation will be d= st

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

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