Tom and Diane start to race. Tom took 4 seconds to run 6 yards. Diane ran 5 yards in 3 seconds. If they continued to run at the same speeds,

Tom and Diane start to race. Tom took 4 seconds to run 6 yards. Diane ran 5 yards in 3 seconds. If they continued to run at the same speeds, who would get to 30 yards first ?

you can get the equation for velocity as

$$v = \dfrac{d}{t}$$

Velocity (v) or speed equals the distance (d) traveled divided by the time (t) it takes to go that distance.

$$\\\small{\text{ $ \begin{array}{lc|cc} \hline \\ t_{Tom}= \dfrac{30\ yards}{v_{Tom}} & \qquad & \qquad & v_{Tom} = \dfrac{6\ yards}{4\ seconds} \\\\ t_{Tom}= \dfrac{30\ yards}{ \dfrac{6\ yards}{4\ seconds} } =\dfrac{ 30\ yards \cdot 4\ seconds }{ 6\ yards }\\\\ t_{Tom}= 20 \ seconds \end{array} $}}\\\\ \begin{array}{lc|cc} \hline \\ t_{Diane}= \dfrac{30\ yards}{v_{Diane}} & \qquad & \qquad & v_{Diane} = \dfrac{5\ yards}{3\ seconds} \\\\ t_{Diane}= \dfrac{30\ yards}{ \dfrac{5\ yards}{3\ seconds} } =\dfrac{ 30\ yards \cdot 3\ seconds }{ 5\ yards }\\\\ t_{Diane}= 18 \ seconds \end{array}$$

Diane get  to 30 yards first in 18 seconds.

speed = distance covered/time taken.

speed of Tom = 6 yards/4 seconds = 1.5 yards per second ,,

speed of Diane = 5 yards/3 seconds = 1.6667 yards per second ,,

since speed of Diane is much more than that of Tom ,,,,, 

DIANE WILL GET TO 30 YARDS FIRST.