<PRE><B>Question 251782</B>
Two trucks leave Chicago traveling in opposite directions. One truck traveled at a rate of 70km/hr, the other at 80km/hr. After how many hours were the trucks 900 km apart?
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Their separation speed was 70+80 = 150 mph.
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Equation:
time = distance /rate
time = 900 mi/150 mph = 6 hrs.
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Cheers,
Stan H.</PRE>