Two planes start from a city and fly in opposite directions, one averaging a speed of \[40\] km/hour greater than the second. If they are \[3400\,\,km\] apart from \[5\] hours, find the sum of their average speeds.

Two planes start from a city and fly in opposite directions, one avera

1.	Two planes start from a city and fly in opposite directions, one averaging a speed of \[40\] km/hour greater than the second. If they are \[3400\,\,km\] apart from \[5\] hours, find the sum of their average speeds.
A.	\[680\,\,km/h\]
B.	\[360\,\,km/h\]
C.	\[320\,\,km/h\]
D.	\[640\,\,km/h\]
Answer» B. \[360\,\,km/h\]

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Two planes start from a city and fly in opposite directions, one averaging a speed of \[40\] km/hour greater than the second. If they are \[3400\,\,km\] apart from \[5\] hours, find the sum of their average speeds.

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