Question 270656
since 150 + 210 = 360
time to scan ocean/time to scan land = 210/150
{{{210/150 = 7/5}}}
If {{{t}}} = time in minutes to scan ocean, then
{{{1 - t}}} = time in minutes to scan land
{{{7/5 = t/(1-t)}}}
Multiply both sides by {{{5*(1-t)}}}
{{{7*(1-t) = 5t}}}
{{{7 - 7t = 5t}}}
{{{12t = 7}}}
{{{t = 7/12}}} min
{{{(7/12)*60 = 35}}}
It takes 35 sec to scan the ocean