SOLUTION: A bus, carrying the members of a marching band, and a truck, carrying their instruments, leave a high school at the same time and travel in the same direction. The bus travels at 7

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Question 323215: A bus, carrying the members of a marching band, and a truck, carrying their instruments, leave a high school at the same time and travel in the same direction. The bus travels at 75 mph and the truck at 60 mph. In how many hours will they be 22.5 miles apart?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
D=RT
D=75T FOR THE BUS.
T=D/75
D-22.5=60T
T=(D-22.5)/60
D/75=(D-22.5)/60 CROSS MULTIPLY.
75(D-22.5)=60D
75D-1,687.5=60D
75D-60D=1,687.5
15D=1,687.5
D=1,687.5/15
D=112.5 MILES.
112.5=75T
T=112.5/75
T=1.5 HOURS THEY WILL BE 22.5 MILES APART.
PROOF:
1.5=(112.5-22.5)/60
1.5=90/60
1.5=1.5