At 10:00 a.m. two planes leave an airport. If the northbound plane flies at 280 mph and the southbound at 320 mph, at what time will they be 1,000 miles apart?

Which equation can be used to solve for t, the time it takes the planes to be 1,000 miles apart?
A.280t + 320t = 1,000
B.320t - 280t = 1,000
C.280 + 320 = 1,000t

Question

At 10:00 a.m. two planes leave an airport. If the northbound plane flies at 280 mph and the southbound at 320 mph, at what time will they be 1,000 miles apart?

Which equation can be used to solve for t, the time it takes the planes to be 1,000 miles apart?
A.280t + 320t = 1,000
B.320t - 280t = 1,000
C.280 + 320 = 1,000t

anonymous · Answer

distance traveled by northbound plane is :
d = 280t
distance traveled by southbound plane is:
d = 320t
You want to add these distances together to get 1000 miles so:
280t + 320t = 1000

anonymous · Answer

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