Question

Jenny drove her tractor down a row of her cornfield. She drove at constant velocity of 34metersperminute down the row. The row was 680meters long. How long did it take for Jenny to drive down one-quarter of the row?

Answer 1

Answer:

5 mins

Step-by-step explanation:

680/4

=170 meters (quarter of 680m)

170/34

=5 mins

Answer 2

If you move at a constant rate, you obey the law

$d=st$

where d is the distance, s is the speed and t is the time.

You know that your speed is 34 meters per minute, and that your distance is 680. We can solve the equation for the time and plug the values:

$d=st\iff t=\dfrac{d}{s}=\dfrac{680}{34}=20$

So, if you need to travel only one quarter of the distance, it will take 20/4 = 5 minutes