SOLUTION: A man runs to a telephone and back in 15 minutes. His speed on the way to the telephone is 5m/s and his speed on the way back is 4m/s. Find the distance to the telephone.

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Question 424363: A man runs to a telephone and back in 15 minutes. His speed on the way to the telephone is 5m/s and his speed on the way back is 4m/s. Find the distance to the telephone.
Answer by stanbon(75887) About Me  (Show Source):
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A man runs to a telephone and back in 15 minutes. His speed on the way to the telephone is 5m/s and his speed on the way back is 4m/s. Find the distance to the telephone.
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"To" DATA:
rate = 5 m/s ; d = x meters ; time = x/5 minutes
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"Back" DATA:
rate = 4 m/s ; d = x meters ; time = x/4 minutes
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Equation:
time + time = 15 minutes
x/5 + x/4 = 15
4x + 5x = 300
9x = 300
x = 33 1/3 meters
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Cheers,
Stan H.
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