Homework Help: math

Posted by Kate on Wednesday, January 2, 2013 at 5:30pm.

Two trucks left buck's trucks traveling in opposite directions. One truck traveled at a rate of 70km/h, the other at 80km/h. After how many hours were the trucks 900km apart?

I got 3 hours as my answer, but I dont think that's right...

math - Kate, Wednesday, January 2, 2013 at 5:38pm
Never minds. I see my mistake. It's really 6 hours.
math - Reiny, Wednesday, January 2, 2013 at 5:41pm
You could easily check your answer.
first truck went 3(70) or 210 km
2nd truck went 3(80) = 240 km

nope, that does not add up to 900, so

let the time be t hours
70t + 80t = 900
150t = 900
t = 6

I will leave it up to you to check my answer.
math - Kate, Wednesday, January 2, 2013 at 5:42pm
thanks. I though because you added 70t and 80t there would be 2ts. But no.

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