SOLUTION: person is planning a driving trip. part of her trip will be along major highways and part will be along country roads and city streets. speed limit on highways is 100/km/hr while l
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Question 860309: person is planning a driving trip. part of her trip will be along major highways and part will be along country roads and city streets. speed limit on highways is 100/km/hr while limit on other roads is 60 km/hr. Total time he wants to spend driving is 12 hours and he has to travel 850 km. how much time should he plan to spend on each type of road. Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! person is planning a driving trip. part of her trip will be along major highways and part will be along country roads and city streets. speed limit on highways is 100/km/hr while limit on other roads is 60 km/hr. Total time he wants to spend driving is 12 hours and he has to travel 850 km. how much time should he plan to spend on each type of road.
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100x + 60(12-x) = 850 km
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100x + 720 - 60x = 850
40x = 130
x = 13/4 = 3 1/4 = 3 hr 15 min(time on major highways)
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12-x = 48/4-13/4 = 35/4 = 8 hr 45 min (time on other roads)
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Cheers,
Stan H.
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