SOLUTION: A cargo plane left Tokyo and flew toward Las Vegas at an average speed of 385.6 km/h. Some time later a passenger plane left flying in the opposite direction with an average speed

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Question 236183: A cargo plane left Tokyo and flew toward Las Vegas at an average speed of 385.6 km/h. Some time later a passenger plane left flying in the opposite direction with an average speed of 201.6 km/h. After the cargo plane had flown for 7.5 hours the planes were 3597.6 km apart. Find the number of hours the passenger plane flew.
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
385.6*7.5+210.6X=3,597,6
2,895+210.6X=3,597.6
210.6X=3,597.6-2,895
210.6X=702.6
X=702.6/210.6
X=3.336 OR 3 HRS & 20 MIN. IS THE FLIGHT TIME FOR THE PASSENGER PLANE.
PROOF:
385.6*7.5+210.6*3.336=3,597.6
2,895+702.6=3,597.6
3,597.6=3,597.6