Posted by **Sara** on Wednesday, October 5, 2011 at 7:37pm.

Tim and Rick both can run at speed Vr and walk at speed , Vw with Vr > vw. They set off together on a journey of distance . Rick walks half of the distance and runs the other half. Tim walks half of the time and runs the other half.

How long does it take Tim to cover the distance?

Express the time taken in terms of Vr, Vw, and D.

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