Question 153602
You can use the distance formula: 
d = r*t where: d = distance (1600 feet in this problem), r = rate (speed, which is 10 ft/3 secs), and t is the time it takes to travel.
Let's rearrange the formula for t:
{{{t = d/r}}} Now substitute the given numbers:
{{{t = (1600)/((10/3))}}} Evaluate this.
{{{t = (1600)*(3/10)}}}
{{{t = 480}}}Seconds.  Convert to minutes by dividing by 60 secs per minute.
{{{t = 8}}}minutes.