SOLUTION: Car A is traveling along a freeway at 100km/h when it is passed by car B. If both cars maintain a constant speed and the end of the freeway is in 10km away, find the speed at which

Question 1110487: Car A is traveling along a freeway at 100km/h when it is passed by car B. If both cars maintain a constant speed and the end of the freeway is in 10km away, find the speed at which car B must travel to beat car A to the end of the freeway by one minute.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
km/hr = speed of car A
Let = speed of car B
Convert minutes to hrs
hrs
Let = time in hrs for car A to
travel km
------------------------------
Car A's equation:
(1)
Car B's equation:
(2)
-------------------------------------
(1)
Plug (1) into (2)
(2)
(2)
(2)
(2) km/hr
-------------------------------------
Car B's speed is
120 km/hr
-------------------------------------
check:
(2)
(2)
(2)
(2)
(2)
OK

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