[" El A person travels along a "],[" str...

[" El A person travels along a "],[" straight road for the first half length "],[" with constant speed "v_(1)" and the "],[" second half length with a constant "],[" speed "v_(2)" .Average speed "v" is "],[[" (a) "(v_(1)v_(2))/(2(v_(1)+v_(2)))," (b) "(2(v_(1)+)/(v_(1)v_(2))]]

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[" El A person travels along a "],[" straight road for the first half length "],[" with constant speed "v_(1)" and the "],[" second half length with a constant "],[" speed "v_(2)" .Average speed "v" is "],[[" (a) "(v_(1)v_(2))/(2(v_(1)+v_(2)))," (b) "(2(v_(1)+)/(v_(1)v_(2))]]

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