Question 602955
t = d / r


24/60 = 90 / (p + w) ___ 2p + 2w = 450


30/60 = 90 / (p - w) ___ p - w = 180 ___ p = 180 + w


substituting ___ 2(180 + w) + 2w = 450 ___ 4w + 360 = 450