SOLUTION: Thor's average driving speed is 25 km/hr faster than Kirk's. In the same length of time it takes Thor to drive 279 km, Kirk only drives 204 km. What is Thor's average speed?

Question 193055: Thor's average driving speed is 25 km/hr faster than Kirk's. In the same length of time it takes Thor to drive 279 km, Kirk only drives 204 km. What is Thor's average speed?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Two equations for Kirk and Thor:

given:

(I'll call them both )

----------------

(1)

(2)
From (1):
(1)
From (2):
(2)
Subtract (1) from (2):

hrs
Plug this result into (2)
2)

Thor's average speed is 93 km/hr
check answer:
(1)

OK
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