SOLUTION: Thor's average driving speed is 15 kilometers per hour faster than Doug's. in the same length of time it takes Thor to drive 267 kilometers, Doug drives only 222 kilometers.What is

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Question 750141: Thor's average driving speed is 15 kilometers per hour faster than Doug's. in the same length of time it takes Thor to drive 267 kilometers, Doug drives only 222 kilometers.What is Thor's average speed?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Thor's average driving speed is 15 kilometers per hour faster than Doug's. in the same length of time it takes Thor to drive 267 kilometers, Doug drives only 222 kilometers.What is Thor's average speed?
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Doug DATA:
distance = 222 km ; speed = x km/hr ; time = d/r = 222/x hrs
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Thor DATA:
distance 267 km ; speed = x+15 km/hr ; time = 267/(x+15) hrs
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Equation:
time = time
222/x = 267/(x+15)
267x = 222x + 3330
45x = 3320
x = 74 km/hr (Doug's speed)
x+15 = 89 km/hr (Thor's speed)
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Cheers,
Stan H.
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