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September 1, 2014

September 1, 2014

Posted by **ryan** on Saturday, October 16, 2010 at 7:27pm.

- math -
**KELLY**, Saturday, October 16, 2010 at 8:19pmMake a chart for the pieces of RT=D that you know.

Rate X Time = Distance

_____________________________________

ship 30 x 30x

chopper 90 x-4 90(x-4)

You know that at the time the helicopter overtakes the ship that the distances are equal.

30x=90(x-4) set distances equal

30x = 90x-360 ditribute

-60x = -360 subt 90xfrom both sides

x =6 divide by -60

x-4 is the helicopter's time so plug in

6 for x

6-4 = 2

therefore the helicopter will take over

in 2 hours.

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