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Suppose Robert cycles at R km per hour. Then Keiko cycles at R+8 km/h.

Time taken = Distance/Speed = 48/R = 72/(R+8)

Cross multiplying: 48*(R+8) = 72*R

ie 48R + 384 = 72R

so that 24R = 384 so that R = 384/24 = 16 km/h

and then K = R+8 = 24 km/h

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