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A car moves with speed v(1) upto (t)/(3)...

A car moves with speed `v_(1)` upto `(t)/(3)` time and then with speed `v_(2)` upto next `(2t)/(3)` time. Path is straight line.What is the average speed of car? " (A) `(2v_(1)v_(2))/(v_(1)+v_(2))` (B) `(v_(1)+v_(2))/(2)` (C) `(2v_(1)+v_(2))/(3)` (D) `(v_(1)+2v_(2))/(3)`

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