It must be the lack of sleep thats giving my brain a brain fart, because I've been looking at this question and the algebra seems so easy but I sincerely can't find the answer. Any help/hints/steps would be greatly appreciated. Thanks guys.
Elena and Martha both can run at speed v(r)and walk at speed v(w), with v(r) > v(w). They set off together on a journey of distance D. Martha walks half of the distance and runs the other half. Elena walks half of the time and runs the other half.
Question: How long does it take Elena to cover the distance D? Find Elena's average speed for covering the distance D.
Thank you .
Elena and Martha both can run at speed v(r)and walk at speed v(w), with v(r) > v(w). They set off together on a journey of distance D. Martha walks half of the distance and runs the other half. Elena walks half of the time and runs the other half.
Question: How long does it take Elena to cover the distance D? Find Elena's average speed for covering the distance D.
Thank you .