you add three and 5 then add 60 on to the anwer
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-5*3/4+t=-9 4/5 -15/4+t=-49/5 t = -196/20 + 75/20 t = -121/20
1/40 + 1/t = 1/24 1/t = 1/24 - 1/40 = 2/120 1/t = 1/60 t = 60 minutes
t=d/s t=60/20 t=3h
T = 1/3 + 1/4 + 1/5 LCM of 3, 4 and 5 is 60 so T = 20/60 + 15/60 + 12/60 = 47/60
r = 60 m/h t = 2 h D = r t = (60m/h) x (2h) = 120 mi