3) Two planes leave Atlanta at 3 pm EST. One flies east and travels at a speed of 75 kilometers per hour slower than the other plane with is flying west. By 7 pm EST, the planes are 5460 kilometers apart. What is the speed of the plane flying east? * A) 645 km/h B) 683 km/h C) 720 km/h D) 1440 km/h.

Question

Mathematics

Emily Barker

26 July, 20:28

3) Two planes leave Atlanta at 3 pm EST. One flies east and travels at a speed of 75 kilometers per hour slower than the other plane with is flying west. By 7 pm EST, the planes are 5460 kilometers apart. What is the speed of the plane flying east? * A) 645 km/h B) 683 km/h C) 720 km/h D) 1440 km/h.

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Answers (2)

Know the Answer?

Marley Acosta · Answer 1

I could be wrong but i think its D) 1440

Danielle Horne · Answer 2

East plane speed = x

Flew for 4 hours = 4x

West plane = (x+75)

Flew for 4 hours = 4 (x+75) = 4x+300

4x + 4x + 300 = 5460

8x = 5160

X = 5160 / 8 = 645

East plane is flying at 645

West plane is flying 645 + 75 = 720