Question 64717
{{{900x + 700(3 - x) = 2352}}}
{{{900x + 2100 - 700x = 2352}}}
{{{200x = 252}}}
{{{x = 1.26}}}
The plane should fly 1.26 hrs before shutting down one engine
to go 2352 km in 3 hrs.
check
{{{900x + 700(3 - x) = 2352}}}
{{{900*1.26 + 700*1.74 = 2352}}}
{{{1134 + 1218 = 2352}}}
{{{2352 = 2352}}}
OK