<PRE><B>Question 190062</B>
Elenore Morales traveled 1600 miles by commerical jet from Kansas City to Spokane. 
She then traveled as additional 500 miles on a private propeller plane from Spokane to Billings. 
If the speed of the jet was 4 times the speed of the propeller plane and the total time in the air was 6 hours, determine the speed of each plane. 
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KC to Spok DATA:
distance = 1600 miles ; rate = 4x mph ; time = 1600/4x = 400/x hrs
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Spok to Bill DATA:
distance = 500 miles ; rate = x mph ; time = 500/x hrs
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Equation:
time + time = 6 hrs
400/x + 500/x = 6
400 + 500 = 6x
6x = 900
x = 150 mph (speed of the propeller plane)
4x = 600 mph (speed of the jet plane)
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Cheers,
Stan H.
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