SOLUTION: two planes leave O'hare airport in chicago at the same time. one flies directly east at 540 miles per hour. the other flies west at 720 miles per hour. how long will it take them t

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Question 273726: two planes leave O'hare airport in chicago at the same time. one flies directly east at 540 miles per hour. the other flies west at 720 miles per hour. how long will it take them to be 1890 apart.
Answer by CharlesG2(834) About Me  (Show Source):
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two planes leave O'hare airport in chicago at the same time. one flies directly east at 540 miles per hour. the other flies west at 720 miles per hour. how long will it take them to be 1890 apart.
am hoping you are asking how long will it take them to be 1890 miles apart
D distance = R rate * T time
540T east plane
720T west plane
720T + 540T = 1890
1260T = 1890
T = 1.5 hours
check: 540 * 1.5 = 810
720 * 1.5 = 1080
810 + 1080 = 1890