SOLUTION: Bob leaves the same time as Jane. Bob drives 4 Mi/h faster than Jane. After 2 hours of driving in opposite directions, they are 116 miles apart. How fast is Bob driving?
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Question 881332: Bob leaves the same time as Jane. Bob drives 4 Mi/h faster than Jane. After 2 hours of driving in opposite directions, they are 116 miles apart. How fast is Bob driving?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = Jane's speed in mi/hr
= Bob's speed in mi/hr
-----------------------
For this problem, think of one of them
( either one ) as standing still and the other one
travelling at the sum of their speeds
---------------------------------------
Bob is driving 31 mi/hr
-----------------------------
check:
Jane's equation:
mi
and
Bob's equation:
------------------------
mi
OK
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