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September 30, 2014

September 30, 2014

Posted by **bert** on Tuesday, January 8, 2008 at 8:34pm.

Please help me, the answer is 36 km but i have no idea how to set it up

- MATH!!!!!!! -
**drwls**, Tuesday, January 8, 2008 at 8:50pmLet D be the distance travelled. The total time moving was 7 - 2 = 5 hours.

Realize that time time spent travelling in one direction is D/V, where V is the speed.

Here is what you know:

D/12 + D/18 = 5 hours

Create a common denominator.

(3D + 2D)/36 = 5

5D/36 = 5

D = 36 km

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