# Algebra

Elena bicycles 4 km/h faster than Robert. In the same time it takes Robert to bicycle 27km/h, Elena can bicycle 39 km. How fast does each bicycle travel?

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1. It would help if you proofread your questions before you posted them (27km/h).

Robert's speed = x and Elena's = x + 4

time = distance/rate

27/x = 39/(x+4)

Solve for x, then x+4.

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