Possibly 72 ton, but there could be many more.....
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2t - 12 - 3t = 60 -1t - 12 = 60 -1t -12 +12 = 60 + 12 -1t = 72 t = -72
Velocity = distance / time Given d = 72 miles ; t = 4 hour V = 72 miles / 4 hour = 18 miles per hour
12(t+6)+8=4(2t-1)+2t 12t+72+8=8t-4+2t 12t-2t-8t=-72-8-4 2t=-84 2t/2=84/2 t=42
72
8x9=72