SOLUTION: Tommy and Lisa leave their houses traveling in opposite direction on a straight road. Tommy drives 15 mph faster than Lisa. After 3 hours they are 225 miles apart. Find each rate
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Question 1049465: Tommy and Lisa leave their houses traveling in opposite direction on a straight road. Tommy drives 15 mph faster than Lisa. After 3 hours they are 225 miles apart. Find each rate
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = Lisa's speed in mi/hr
= Tommy's speed in mi/hr
------------------------------------
Think of this as one of them standing still
and the other one moving at the sum of their speeds
and
-------------------
Tommy's speed is 45 mi/hr
Lisa's speed is 30 mi/hr
----------------------------
check:
mi
and
mi
--------------------
mi
OK
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