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Solution:
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Let the distance be \( d \) km.
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Time from A to B = \( \frac{d}{60} \) hours
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Time from B to A = \( \frac{d}{40} \) hours
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Total time = 5 hours
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\(\frac{d}{60} + \frac{d}{40} = 5\)
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Common denominator is 120:
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\(\frac{2d}{120} + \frac{3d}{120} = 5\)
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\(\frac{5d}{120} = 5\)
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\(5d = 600\)
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\(d = 120\) km
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