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OpenStudy (anonymous):
At 8:30 a.m., two planes leave St. Louis. One flies east at 540 km/h, and the other flies west at 620 km/h. At what time will they be 1,450 km apart? A. 9:45 a.m. B. 9:55 a.m. C. 10:55 a.m. D. 1:15 p.m.
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OpenStudy (anonymous):
Can anyone please help?
OpenStudy (anonymous):
they're separating at 620 + 540 = 1160 km/h and time = distance/speed, so 1450/1160 = 1.25 hr 1.25 hr after 8:30 is 9:45am, answer A
OpenStudy (anonymous):
you ok now?
OpenStudy (anonymous):
YES!! THANKS A LOT!
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